July ___, 2005


Argyle Security Acquisition Corporation
200 Concord Plaza, Suite 700
San Antonio, Texas 78216
Attn: Ron Chaimovski

Rodman & Renshaw, LLC
330 Madison Avenue
New York, New York 10017
Attn:  Edward Kovalik

            Re:   Initial Public Offering

Gentlemen:

            The  undersigned  stockholder,  officer  and/or  director  of Argyle
Security  Acquisition  Corporation  ("Company"),  in  consideration  of Rodman &
Renshaw, LLC ("Rodman") entering into a letter of intent ("Letter of Intent") to
underwrite an initial public  offering of the securities of the Company  ("IPO")
and embarking on the IPO process,  hereby agrees as follows (certain capitalized
terms used herein are defined in paragraph 11 hereof):

            1.  If  the  Company  solicits  approval  of its  stockholders  of a
Business Combination,  the undersigned will vote all Insider Shares owned by him
in  accordance  with the  majority  of the votes cast by the  holders of the IPO
Shares.

            2. In the event  that the  Company  fails to  consummate  a Business
Combination  within 18 months from the effective date ("Effective  Date") of the
registration statement relating to the IPO (or 24 months under the circumstances
described in the prospectus  relating to the IPO), the undersigned will take all
reasonable actions within his power to cause the Company to liquidate as soon as
reasonably practicable. In such event, the undersigned hereby waives any and all
right,  title,  interest  or  claim  of  any  kind  in  or  to  any  liquidating
distributions by the Company, including, without limitation, any distribution of
the  Trust  Fund (as  defined  in the  Letter  of  Intent)  as a result  of such
liquidation  with respect to his Insider Shares  ("Claim") and hereby waives any
Claim the  undersigned may have in the future as a result of, or arising out of,
any contracts or agreements with the Company and will not seek recourse  against
the Trust Fund for any reason  whatsoever.  The undersigned  agrees to indemnify
and hold  harmless  the  Company  against any and all loss,  liability,  claims,
damage and expense whatsoever (including,  but not limited to, any and all legal
or other expenses reasonably  incurred in investigating,  preparing or defending
against any litigation,  whether pending or threatened, or any claim whatsoever)
which the Company may become subject as a result of any claim by any vendor that
is owed money by the Company for services  rendered or products sold but only to
the extent  necessary  to ensure  that such loss,  liability,  claim,  damage or
expense does not reduce the amount in the Trust Fund.




Argyle Security Acquisition Corporation
Rodman & Renshaw, LLC
July ___, 2005
Page 2

            3. In order to minimize  potential  conflicts of interest  which may
arise  from  multiple  affiliations,  the  undersigned  agrees to present to the
Company for its  consideration,  prior to  presentation  to any other  person or
entity,  those  opportunities  to acquire an operating  business the undersigned
reasonably  believes  are  suitable  for the  Company,  until the earlier of the
consummation  by the Company of a Business  Combination,  the liquidation of the
Company  or until  such  time as the  undersigned  ceases  to be an  officer  or
director of the Company,  subject to any fiduciary  obligations  the undersigned
might have.

            4. The undersigned acknowledges and agrees that the Company will not
consummate any Business Combination which involves a company which is affiliated
with  any of the  Insiders  unless  the  Company  obtains  an  opinion  from  an
independent  investment  banking firm  reasonably  acceptable to Rodman that the
business  combination  is fair to the  Company's  stockholders  from a financial
perspective.

            5.  Neither  the  undersigned,  any  member  of  the  family  of the
undersigned,  nor any Affiliate of the  undersigned  will be entitled to receive
and will not accept any  finder's  fee or any other  compensation  for  services
rendered to the Company prior to the  consummation of the Business  Combination;
provided  that the  undersigned  shall be  entitled  to  reimbursement  from the
Company for his  out-of-pocket  expenses incurred in connection with seeking and
consummating a Business Combination.

            6.  Neither  the  undersigned,  any  member  of  the  family  of the
undersigned,  or any Affiliate of the undersigned will be entitled to receive or
accept a finder's fee or any other  compensation  in the event the  undersigned,
any member of the family of the  undersigned or any Affiliate of the undersigned
originates a Business Combination.

            7. The undersigned will escrow his Insider Shares for the three-year
period commencing on the Effective Date,  subject to the terms of a Stock Escrow
Agreement  which the Company will enter into with the  undersigned and an escrow
agent acceptable to the Company.

            8. The  undersigned  agrees  to be the  Chairman  of the  Board  and
Co-Chief  Executive Officer of the Company until the earlier of the consummation
by the Company of a Business  Combination or the liquidation of the Company. The
undersigned's  biographical  information furnished to the Company and Rodman and
attached hereto as Exhibit A is true and accurate in all respects, does not omit
any  material  information  with  respect to the  undersigned's  background  and
contains all of the information required to be disclosed pursuant to Section 401
of  Regulation  S-K,   promulgated   under  the  Securities  Act  of  1933.  The
undersigned's  Questionnaire  furnished to the Company and Rodman and annexed as
Exhibit  B  hereto  is  true  and  accurate  in all  respects.  The  undersigned
represents and warrants that:

            (a) he is not subject to or a  respondent  in any legal  action for,
any  injunction,  cease-and-desist  order or order or  stipulation  to desist or
refrain from any act or practice  relating to the offering of  securities in any
jurisdiction;


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Argyle Security Acquisition Corporation
Rodman & Renshaw, LLC
July ___, 2005
Page 3

            (b) he has never been  convicted  of or pleaded  guilty to any crime
(i)  involving  any  fraud or (ii)  relating  to any  financial  transaction  or
handling of funds of another person,  or (iii) pertaining to any dealings in any
securities and he is not currently a defendant in any such criminal  proceeding;
and

            (c) he has never been  suspended or expelled from  membership in any
securities  or  commodities  exchange  or  association  or had a  securities  or
commodities license or registration denied, suspended or revoked.

            9. The undersigned has full right and power,  without  violating any
agreement by which he is bound, to enter into this letter agreement and to serve
as Chairman of the Board and Co-Chief Executive Officer of the Company.

            10. The undersigned authorizes any employer,  financial institution,
or  consumer  credit  reporting  agency  to  release  to  Rodman  and its  legal
representatives  or agents (including any investigative  search firm retained by
Rodman) any  information  they may have about the  undersigned's  background and
finances ("Information"),  solely for the purposes of the Company's IPO. Neither
Rodman nor its agents shall be violating the  undersigned's  right of privacy in
any manner in  requesting  and  obtaining the  Information  and the  undersigned
hereby  releases  them  from  liability  for  any  damage   whatsoever  in  that
connection.

            11. As used  herein,  (i) a  "Business  Combination"  shall  mean an
acquisition  by merger,  capital  stock  exchange,  asset or stock  acquisition,
reorganization or otherwise, of one or more operating businesses in the security
industry  selected by the  Company;  (ii)  "Insiders"  shall mean all  officers,
directors and  stockholders of the Company  immediately  prior to the IPO; (iii)
"Insider  Shares"  shall mean all of the shares of Common  Stock of the  Company
owned by an  Insider  prior to the IPO;  and (iv) "IPO  Shares"  shall  mean the
shares of Common Stock issued in the Company's IPO.



                                    --------------------------------
                                    Bob Marbut


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Argyle Security Acquisition Corporation
Rodman & Renshaw, LLC
July ___, 2005
Page 4


                                    EXHIBIT A

                        [Insider's biographical information]

Bob Marbut has been our Chairman of the Board and Co-Chief Executive Officer
since our inception. From November 2004 to the present, Mr. Marbut has been the
Executive Chairman of Electronics Line 3000 Ltd., an electronic intrusion
security company, and from July 2002 to the present, he has been the Chairman
and Chief Executive Officer of SecTecGLOBAL, Inc., a sales and marketing
subsidiary of Electronics Line 3000 Ltd. From October 2001 to the present, Mr.
Marbut has served as a Manager or Co-Manager of Argyle Global Opportunities, LP,
an investment partnership which owns a 43% interest in Electronics Line 3000
Ltd. From January 2001 to January 2003, Mr. Marbut served as the Chairman of
Hearst-Argyle Television, Inc., a non-network owned television group and, from
August 1997 to January 2001, served as its Chairman and Co-Chief Executive
Officer. From January 1995 to August 1997, Mr. Marbut was the co-founder,
Chairman and controlling partner of Argyle Television, Inc., which became a
Nasdaq traded company and was merged with Hearst Broadcasting in August 1997 to
form Hearst-Argyle Television, Inc. From 1993 to 1995, Mr. Marbut founded and
was the Chief Executive Officer of Argyle Television, a private television group
that was sold in 1995. From August 1970 through 1990, Mr. Marbut served as the
President and Chief Executive Officer of Harte-Hanks Communications, Inc., and
concurrently as its Chief Operating Officer from April 1973 to September 1984,
and as Vice-Chairman in 1991. During the period that Mr. Marbut was CEO,
Harte-Hanks developed from a family-owned newspaper company to a Fortune 500
company listed on the New York Stock Exchange that Mr. Marbut took private in
1984 in a management buyout that he led. In addition to the board of directors
of Electronics Line 3000 Ltd., Mr. Marbut currently serves on the boards of
directors of Hearst-Argyle Television, Tupperware Corporation and Valero Energy
Corporation. He has a Masters of Business Administration degree with Distinction
from Harvard University and was a registered engineer in the State of
California.


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