James R. Hagerty                                  888 17th Street NW, Suite 1000
jhagerty@kalbianhagerty.com                                Washington, DC  20006

(202) 223-5600 Telephone
(202) 223-6625 Facsimile

                                 March 7, 2006

Laurus Capital Management, LLC
825 Third Ave., 14th Floor
New York, New York 10022

                 Re:  GSE Systems, Inc., a Delaware Corporation

Ladies and Gentlemen:

     This firm has acted as counsel to GSE Systems, Inc., a Delaware Corporation
(the "Company"),  GSE Power Systems, Inc., a Delaware corporation ("GSE Power"),
GSE Services Company LLC, a Delaware limited liability company ("Services"), GSE
Erudite Software Inc., a Delaware  corporation  ("Erudite"),  GSE Government and
Military  Simulation Systems,  Inc., a Delaware  corporation  ("Military"),  GSE
Process Solutions,  Inc., a Delaware  corporation  ("Process") and MSHI, Inc., a
Virginia  corporation  ("MSHI," and together  with Process,  Military,  Erudite,
Services and GSE Power,  the  "Subsidiaries")  in connection with the $5,000,000
credit facility  between the Company,  GSE Power and Laurus Master Fund, Ltd., a
Cayman Islands company (the "Creditor") in the form of the following  documents,
all dated as of the date hereof: (i) a secured,  non-convertible  revolving note
issued  by the  Company  and GSE  Power to the  Creditor  (the  "Note");  (ii) a
Security  Agreement  by and among the  Creditor,  the Company and GSE Power (the
"Secur ity  Agreement");  (iii) that certain Stock Pledge Agreement by and among
the Creditor,  the Company,  GSE Power,  MSHI and Process (the "Stock  Pledge");
(iv) that certain Subsidiary Guaranty by and among the Creditor, the Company and
its Subsidiaries ("Subsidiary Guaranty"); (v) that certain Common Stock Purchase
Warrant by and among the  Creditor and the Company  (the  "Warrant");  (vi) that
certain Funds Escrow Agreement by and among the Creditor, the Company and Loeb &
Loeb  LLP  (the  "Escrow  Agreement");  (vii)  that  certain  Control  Agreement
Regarding Limited  Liability  Company  Interests by and among the Creditor,  the
Company and Services (the "Control Agreement");  (viii) Authorizing  Resolutions
of each of GSE  Power,  Process,  Erudite,  Military,  Services  and  MSHI  (the
"Authorizing   Resolutions");   (ix)  that  certain   Disbursement  Letter  (the
"Disbursement  Letter");  that certain IP  Assignment by and among the Creditor,
the Company and GSE Power (the "IP Assignment");  (xi) that certain Registration
Rights  Agreement by and among the  Creditor and the Company (the  "Registration
Rights");   and  (xii)  that  certain  Post-Closing  Letter  (the  "Post-Closing
Letter").

     For  purposes  of this  opinion  letter,  we have  examined  copies  of the
following documents (the "Documents"):

     1.   Certificate of  Incorporation  of the Company,  as amended through the
          date hereof;

     2.   Bylaws of the Company as amended through the date hereof;

     3.   Certificate  of Good  Standing for the Company  issued by the State of
          Delaware;

     4.   Certificate  of Good  Standing for the Company  issued by the State of
          Maryland;

     5.   Resolutions  of the Board of  Directors of the Company with respect to
          the transactions referred to herein;

     6.   A certificate of the Secretary of the Company, dated March 1, 2006, as
          to the incumbency and signatures of certain officers of the Company;

     7.   Certificate of Incorporation of GSE Power, as amended through the date
          hereof;

     8.   Certificate of Good Standing of Power;

     9.   Certificate of Incorporation  of Process,  as amended through the date
          hereof;

     10.  Certificate of Good Standing of Process;

     11.  Certificate of Incorporation  of Erudite,  as amended through the date
          hereof;

     12.  Certificate of Good Standing of Erudite;

     13.  Certificate of Incorporation of Military,  as amended through the date
          hereof;

     14.  Certificate of Good Standing of Military;

     15.  Certificate  of  Formation of  Services,  as amended  through the date
          hereof;

     16.  Certificate of Good Standing of Services;

     17.  Articles of Incorporation of MSHI, as amended through the date hereof;

     18.  Certificate of Good Standing of MSHI;

     19.  Security Agreement, dated as of March 6, 2006;

     20.  Note, dated as of March 6, 2006;

     21.  Warrant dated as of March 6, 2006;

     22.  Registration Rights, dated as of March 6, 2006;

     23.  Control Agreement, dated as of March 6, 2006;

     24.  Escrow Agreement, dated as of March 6, 2006;

     25.  Disbursement Letter, dated as of March 6, 2006;

     26.  Subsidiary Guaranty, dated as of March 6, 2006;

     27.  IP Assignment, dated as of March 6, 2006;

     28.  Stock Pledge, dated as of March 6, 2006; and

     29.  Authorizing Resolutions, dated as of March 6, 2006.

     The Security Agreement, the Note, the Warrant, the Registration Rights, the
Control  Agreement,   the  Escrow  Agreement,   the  Subsidiary  Guaranty,   the
Disbursement  Letter,  the Stock  Pledge,  the IP  Assignment,  the Post Closing
Letter and the Authorizing  Resolutions are hereinafter referred to individually
as a "Transaction Document" and collectively as the "Transaction  Documents." In
our examination of the Transaction  Documents and the other  Documents,  we have
assumed the  genuineness of all signatures  (other than those of the Company and
the Subsidiaries),  the legal capacity of all natural persons,  the accuracy and
completeness of all of the Documents,  the  authenticity of all originals of the
Documents  and the  conformity  to authentic  originals of all of the  Documents
submitted to us as copies (including telecopies). As to matters of fact relevant
to the opinions  expressed  herein,  we have relied on the  representations  and
statements of fact made in the Documents, we have not independently  established
the facts so relied on, and we have not made any  investigation or inquiry other
than our  examination  of the Documents.  The opinion  letter is given,  and all
statements herein are made, in the context of the foregoing.

     In addition to the above stated  assumptions and limitations,  the opinions
which  follow  are  subject  to  the  following   additional   assumptions   and
limitations:

     1.   The  undersigned  has  assumed  the  organization,   existence,   good
          standing, qualification (to do business) and capacity of the Creditor,
          and that the Creditor has the right, power and authority to enter into
          this transaction;

     2.   The  undersigned  has assumed that there has been no mutual mistake of
          fact or  misunderstanding  or  fraud,  duress or undue  influence,  in
          connection  with  the  negotiation,   execution  or  delivery  of  the
          Transaction  Documents,   and  the  conduct  of  all  parties  to  the
          Transaction  Documents  has  complied  with any  requirements  of good
          faith, fair dealing and conscionability;

     3.   There  are and have been no  agreements  or  understandings  among the
          parties,  written or oral, and there is and has been no usage of trade
          or  course of prior  dealings  among the  parties  to the  Transaction
          Documents that would,  in either case,  define,  supplement or qualify
          the terms of the Transaction Documents; and

     4.   This opinion letter is based as to matters of law solely on applicable
          provisions of the following, as currently in effect: (i) United States
          Federal  Law;  (ii)  the  General  Corporation  Law  of the  State  of
          Maryland;  (iii) the Virginia Code;  and (iv) the General  Corporation
          Law of the State of Delaware.

     Based upon such  examinations  and the assumptions  and limitations  stated
above,  and in the  undersigned's  capacity  as  counsel  for the  Company,  the
undersigned is of the opinion that:

     1.   The Company is a corporation,  duly organized, validly existing and in
          good standing under the laws of the State of Delaware, and possess all
          requisite   power  and  authority  to  own,   operate  and  lease  its
          properties, to carry on its business as it is now being conducted, and
          to execute,  deliver and perform its obligations under the Transaction
          Documents;

     2.   The Company is duly qualified and in good standing to do business as a
          foreign corporation in Maryland;

     3.   The Company has full and  requisite  corporate  power and authority to
          execute,  deliver and perform its  obligations  under the  Transaction
          Documents;

     4.   The  authorization,  execution  and delivery by the Company of each of
          the  Transaction  Documents,  and the  performance of all  obligations
          thereunder, has been duly authorized by all necessary corporate action
          on behalf of the Company;

     5.   Each of GSE Power,  Process,  Erudite and  Military is a  corporation,
          duly  organized  and in good  standing  under the laws of the State of
          Delaware,  possesses all power and authority to own, operate and lease
          its  properties  and to  carry  out its  business  as it is now  being
          conducted and to execute,  deliver and perform its  obligations  under
          the Transaction Documents;

     6.   The authorization,  execution and delivery by the Subsidiaries of each
          of the Transaction  Documents,  and the performance of all obligations
          thereunder, has been duly authorized by all necessary corporate action
          on behalf of each of the Subsidiaries;

     7.   MSHI is a  corporation,  duly organized and in good standing under the
          laws of the Commonwealth of Virginia, and MSHI possesses all requisite
          power and authority to own, operate and lease its properties, to carry
          out its business as it is now being conducted and to execute,  deliver
          and perform its obligations under the Transaction Documents;

     8.   Except  as  set  forth  in the  Transaction  Documents,  there  are no
          actions,  suits  proceedings  or  investigations  pending  or,  to our
          knowledge,  threatened  against the Company or any of the Subsidiaries
          before any court or administrative  agency where such action,  suit or
          proceeding:  (a) either  individually  or in the aggregate  would have
          material  adverse  effect  on  the  business,   assets,   liabilities,
          financial  condition,  or results of the  operations of the Company or
          the  Subsidiaries;  (b) calls into question the validity of any of the
          Transaction  Documents  or any  action  taken or to be taken  pursuant
          thereto;  or (c) seeks to prevent the consummation of the transactions
          contemplated by the Transaction  Documents.  To our knowledge  neither
          the  Company nor any of the  Subsidiaries  is a party to or subject to
          the  provisions  of any order,  injunction,  judgment or decree of any
          court or  government  agency  or  instrumentality;  nor is  there  any
          action,   proceeding   or   investigations   by  the  Company  or  the
          Subsidiaries,  or any actio n,  proceeding or  investigation  that the
          Company or the Subsidiaries intends to initiate;

     9.   No  approval or consent of, or  registration,  filing or other  action
          with any state or federal  governmental  authority,  is required to be
          obtained or made by the Company and the Subsidiaries  under applicable
          federal law or applicable  state law in connection with the execution,
          delivery  and  performance  on the date  hereof by the Company and the
          Subsidiaries of each of the Transaction Documents,  except for (a) the
          authorizations which have previously been obtained,  taken or made and
          (b) filings such as may be required to be filed pursuant to applicable
          federal and state  securities laws  subsequent to the  consummation of
          the transactions contemplated by the Transaction Documents;

     10.  Neither the  execution  and  delivery of, nor the  performance  by the
          Company and its Subsidiaries of its obligations under the Transactions
          Documents,  including without  limitation,  the Company's issuance and
          delivery of the Warrant will,  with or without the giving of notice or
          the passage of time or both,: (a) violate, conflict with, or result in
          a  breach  or  default  under  any  provision  of the  Certificate  of
          Incorporation of such entity,  as amended through the date hereof,  or
          Bylaws of such entity, (b) violates any judgment, decree, governmental
          order,  statute,  law, rule or regulations to which the Company or any
          Subsidiary is subject including,  without  limitation,  any applicable
          state law pertaining to permissible  interest rates,  (c) results in a
          violation,  breach or  default  by the  Company  (or gives rise to any
          right of termination,  cancellation or acceleration)  under conditions
          or provisions of any material agreement,  or (d) violate any Delaware,
          Maryland, Virginia or federal law;

     11.  No  taxes,  fees  or  other  charges,  including  without  limitation,
          intangible,  documentary, stamp, mortgage, transfer or recording taxes
          or similar charges are payable to any  governmental or regulatory body
          on account of the execution or delivery of the Warrants;

     12.  Assuming the accuracy of the  representations  and  warranties  of the
          Creditor  contained in the  Security  Agreement,  the offer,  sale and
          issuance of the Securities on the Closing Date will be exempt from the
          registration  requirements  of the  Securities  Act. To our knowledge,
          neither  the  Company,  nor  any of the  Subsidiaries,  nor any of its
          affiliates, nor any person acting on its or their behalf, has directly
          or  indirectly  made any offers or sales of any  security or solicited
          any offers to buy any security  under  circumstances  that would cause
          the offering of the Securities  pursuant to the Security  Agreement to
          be integrated  with prior offerings by the Company for purposes of the
          Securities  Act which  would  prevent  the  Company  from  selling the
          Securities  pursuant  to Rule 506 under  the  Securities  Act,  or any
          applicable exchange-related stockholder approval provisions;

     13.  The Company is not an "investment  company" or a company  "controlled"
          by an  "investment  company"  within  the  meaning  of the  Investment
          Company Act of 1940, as amended;

     14.  The  authorized  capital  stock of the Company is as  described in the
          Transaction  Documents.  All issued and  outstanding  shares of Common
          Stock of the Company have been duly authorized and validly issued, and
          are fully paid and nonassessable and free of any preemptive or similar
          rights.  To  our  knowledge,   except  for  rights  described  in  the
          Transaction  Documents or the incorporated  SEC filings,  there are no
          other  options,  warrants,   conversion  privileges  or  other  rights
          presently  outstanding to purchase or otherwise acquire any authorized
          but  unissued  shares  of  capital  stock or other  securities  of the
          Company,  or any other  agreements to issue any such securities of the
          Company,  or any  other  agreements  to issue any such  securities  or
          rights;

     15.  The Common Stock  underlying the exercise of the Warrant,  when issued
          pursuant  to and in  accordance  with  the  terms  of the  Transaction
          Documents and upon delivery shall be validly  issued and  outstanding,
          fully paid and non assessable;

     16.  Nothing has come to our  attention  that has caused us to believe that
          the  Transaction  Documents,  at  the  date  thereof,  or  any  of the
          Company's  public filings with the Securities and Exchange  Commission
          (the  "SEC"),  at the date they were filed with the SEC,  contained an
          untrue  statement  of a  material  fact or omitted to state a material
          fact required to be stated therein or necessary to make the statements
          therein not misleading;

     17.  The Security  Agreement and the Ancillary  Agreements will constitute,
          valid  and  legally  binding  obligations  of  each  Company  and  the
          Subsidiaries  (to the extent such entity is a party thereto),  and are
          enforceable  against the Company and the Subsidiaries party thereto in
          accordance  with their  respective  terms,  except:  (a) as limited by
          applicable bankruptcy, insolvency, reorganization, moratorium or other
          laws  of  general  application  affecting  enforcement  of  creditors'
          rights;  and (b)  general  principles  of  equity  that  restrict  the
          availability of equitable or legal remedies;

     18.  To our  knowledge,  the  issuance  of the Note is not  subject  to any
          preemptive  rights  or  rights  of first  refusal  that  have not been
          properly  waived or complied with. To our  knowledge,  the issuance of
          the Warrant and the  subsequent  exercise of the Warrant for shares of
          Common  Stock are not  subject  to any  preemptive  rights  or, to our
          knowledge,  rights of first refusal that have not been properly waived
          or complied with;

     19.  The terms  and  provisions  of the  Security  Agreement  and the Stock
          Pledge create a valid security  interest in favor of the Creditor,  in
          the  respective  rights,  title and  interests  of the Company and the
          Subsidiaries  in and to the  Collateral  (as  defined  in  each of the
          Security Agreement and the Stock Pledge).  The terms and provisions of
          the IP  Assignment  create a valid  security  interest in favor of the
          Creditor in the respective rights,  title and interests of the Company
          and the Subsidiaries in and to the T + P Collateral (as defined in the
          IP  Assignment).  The terms and  provisions  of the Control  Agreement
          create a valid  security  interest  in favor  of the  Creditor  in the
          rights,  title and  interests of the Company in the  Issuer's  Pledged
          Interests (as defined in the Control Agreement).  Each UCC-1 Financing
          Statement naming the Company and the Subsidiaries as debtor and Laurus
          as secured  party are in proper form for filing and assuming that such
          UCC-1 Financing Statements have been filed with the Secretary of State
          of Delaware, Maryland or Virginia, the security interest created under
          the Security  Agreement will constitute a perfected  security interest
          under the Uniform  Commercial Code in favor of the Creditor in respect
          of the  Collateral  that  can  be  perfected  by  filing  a  financing
          statement.  After giving effect to the delivery to the Creditor of the
          stock  certificates  representing  the  ownership  interests  of  each
          Subsidiary of each Company (together with effective  endorsements) and
          assuming  the  continued  possession  by the  Creditor  of such  stock
          certificates in the State of New York, the security  interest  created
          in favor of the  Creditor  under  the  Stock  Pledge  and the  Control
          Agreement constitutes a valid and enforceable first perfected security
          interest in such  ownership  interests  (and the proceeds  thereof) in
          favor of the  Creditor,  subject  to no other  security  interest.  No
          filings,  registrations or recordings are required in order to perfect
          (or maintain the perfection or priority of) the security  interest cre
          ated under the Stock  Pledge  Agreement  or the Control  Agreement  in
          respect of such ownership interests; and

     20.  The "Lockbox Control Agreement",  dated as of March 6, 2006, among the
          Creditor,  each Company and Wachovia Bank,  N.A. is sufficient to give
          the  Creditor  "control"  within the  meaning of Section  9-104 of the
          Maryland  Commercial  Law Code  over the  lockbox  deposit  account(s)
          referenced  therein,  as a result  thereof,  the  Creditor's  security
          interest  in such  lockbox  deposit  accounts  (and funds  therein) is
          perfected.

     The foregoing  opinions are limited in all respects and for all purposes to
applicable federal and state laws (excluding the principles of  conflict-of-laws
or  choice-of-laws)  as presently in effect.  To the extent the matters  covered
hereby relate to the laws of any other  jurisdiction,  the  undersigned  has not
consulted  with legal  counsel who are experts with respect to such laws and the
undersigned  expresses  no  opinion  on the laws of such  jurisdiction(s)  might
affect the opinions expressed in this opinion letter.

     The undersigned  assumes no obligation to supplement this opinion letter if
any of the  applicable  laws  (statutory,  decisional  or  other)  or any of the
underlying facts or circumstances changes in any way. This opinion is based upon
and relies upon the current status of law and in all respects is subject to, and
may be  limited  by,  future  legislation  as well as by  developing  case laws,
statutes,  ordinances,  rules and regulations and facts,  all as in existence on
this date, and the  undersigned  expresses no opinion as to the effect which any
future amendments,  changes,  additions,  or modifications thereof may have upon
the future performance or enforceability of the Transaction Documents.

     While this opinion letter is given as of the date hereof,  it is based upon
certifications of various facts as of the dates referenced  herein, and does not
cover any  matters  arising at any time  subsequent  thereto,  unless  otherwise
expressly  stated  herein.  Nothing  has  come  to the  undersigned's  attention
subsequent  to the date hereof which should cause the  undersigned  to doubt the
continued state of facts as therein certified.

     The foregoing  opinions are limited to matters  expressly set forth herein,
and no  opinions  are to be  implied  or may be  inferred  beyond  the  opinions
expressly so stated.  The foregoing  opinions are legal opinions only and do not
constitute a guaranty or warranty of matters discussed therein.

     This opinion shall run solely to the Creditor and its counsel. This opinion
letter  may not be quoted or relied on (or claim of  reliance)  by,  nor  copies
delivered to, any other person or used for any other purpose without the express
prior written consent of the undersigned in each instance.



                                KALBIAN HAGERTY, LLP


                                By:_____________________
                                Name: James R. Hagerty, Esq.