EXHIBIT 99.4

                        REVOLVING CREDIT PROMISSORY NO IL

$7,500,000.00                                                  September 1, 2005


      FOR VALUE RECEIVED, the undersigned ACORN HOLDING CORP. and VALENTEC SYS I
EMS, INC., its wholly owned subsidiary,  each a Delaware corporation  (together,
"Makers"),  jointly and severally promise to pay to the order of ROCKLAND CREDIT
FINANCE LLC, a Maryland  limited  liability  company  (which,  together with its
successors, endorsees and assigns, is hereinafter referred to as "Lender"), at 6
Park Center Court,  Owings Mills,  MD 21117, or such other place as Lender shall
designate  from time to time,  the  principal  sum of SEVEN MILLION FIVE HUNDRED
THOUSAND AND 00/100 DOLLARS  ($7,500,000.00)  (the "Principal  Sum"), or so much
thereof as may be advanced by Lender  pursuant to the Agreement (as  hereinafter
defined),  together with interest  thereon at the  Applicable  Rate and Lender's
Processing  Fee, in a single payment of principal and accrued  interest and fees
on the Line of Credit Termination Date.

      This  Note is being  delivered  in  connection  with that  certain  Master
Factoring  Agreement  between  Makers  and  Lender  and  Addendum  No. 1 thereto
(together, the "Agreement"),  each dated the date hereof. Capitalized terms used
but not  defined in this Note have the  meanings  ascribed  to such terms in the
Agreement.

      Lender is hereby authorized as Makers' attorney-in-fact to note on Annex A
hereto the borrowings,  payments and reborrowings of Makers pursuant to the Line
of Credit and such notations by Lender shall be definitive evidence thereof. The
terms and conditions of this Note, in addition to those set forth above,  are as
follows:

      1.    Attorneys'  Fees. If this Note is placed in the hands of an attorney
for collection,  whether suit is brought or not, reasonable  attorneys' fees and
expenses in addition to the amount due hereon shall, to the extent  permitted by
law, be collectible herewith upon demand by the holder of this Note.

      2.    Interest  Year.  All  computations  of interest shall be made on the
basis of a year of three hundred sixty-five (365) days.

      3.    Application  of Payments,  Etc. All payments made on account of this
Note shall be applied first to fees and charges accruing hereunder, if any, then
to accrued and unpaid interest,  and the remainder,  if any, shall be applied to
the unpaid  Principal Sum. All payments on account of this Note shall be paid in
lawful money of the United States of America in immediately available funds.

      4.    Security. Pursuant to the Agreement, Makers have granted to Lender a
security  interest  in  Collateral,  comprising  substantially  of the assets of
Makers,  as  security  for the  payment  and  performance  by  Makers  of  their
obligations under this Note.

      5.    Partial Invalidity.  In the event any provision of this Note (or any
part  of any  provision)  is held by a court  of  competent  jurisdiction  to be
invalid, illegal, or unenforceable in any respect, such invalidity,  illegality,


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or  unenforceability  shall not affect any other provision (or remaining part of
the  affected  provision)  of this Note;  but this Note shall be construed as if
such invalid, illegal, or unenforceable provision (or part thereof) had not been
contained  in this  Note,  but only to the  extent it is  invalid,  illegal,  or
unenforceable.

      6.    Governing  Law.  This Note shall be  governed  by and  construed  in
accordance with the State of Maryland.

      7.    JURISDICTION;  WAIVER  OF RIGHT TO JURY  TRIAL.  EACH  MAKER  HEREBY
IRREVOCABLY  CONSENTS  TO THE  PERSONAL  JURISDICTION  AND VENUE OF ANY STATE OR
FEDERAL COURT  LOCATED  WITHIN THE STATE OF MARYLAND FOR PURPOSES OF ANY AND ALL
ACTIONS AND PROCEEDINGS  ARISING UNDER OR PURSUANT TO THIS NOTE OR ARISING UNDER
OR PURSUANT TO THE AGREEMENT.  EACH MAKER HEREBY IRREVOCABLY WAIVES ITS RIGHT TO
A JURY TRIAL IN CONNECTION  WITH ANY SUCH ACTION OR  PROCEEDING  AND AGREES THAT
ANY SUCH ACTION OR  PROCEEDING  SHALL BE TRIED  SOLELY  BEFORE THE COURT AND NOT
BEFORE A JURY.

      8.    Miscellaneous.  Each right,  power, and remedy of Lender as provided
for in this  Note or the  Agreement,  or now or  hereafter  existing  under  any
applicable  law or otherwise  shall be cumulative and concurrent and shall be in
addition to every other right, power, or remedy provided for in this Note or now
or hereafter existing under any applicable law, and the exercise or beginning of
the  exercise  by Lender of any or all such other  rights,  powers,  or remedies
shall not preclude the  simultaneous  or later  exercise by Lender of any or all
such rights,  powers, or remedies.  No failure or delay by Lender to insist upon
the strict performance of any term,  condition,  covenant,  or agreement of this
Note or to  exercise  any  right,  power,  or  remedy  consequent  upon a breach
thereof,  shall constitute a waiver of any such term,  condition,  covenant,  or
agreement of any such breach, or preclude Lender from exercising any such right,
power,  or remedy at a later  time or times.  By  accepting  partial  payment or
payment  after the due date of any amount  payable under the terms of this Note,
Lender shall not be deemed to waive the right either to require  prompt  payment
when due of all other amounts  payable  under the terms of this Note.  This Note
may not be changed  orally,  but only by an agreement  in writing  signed by the
parties  against  whom  enforcement  of  any  waiver,  change,  modification  or
discharge is sought.

           [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK.]


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      IN  WITNESS  WHEREOF,  each of the  undersigned,  intending  to be legally
bound,  has duly executed this Note as of the day and year first above  written.
WITNESS/A l"1 hST:

WITNESS/ATTEST:                            ACORN HOLDING CORP.


By___________________________________      By___________________________________
  Name:                                      Name:
                                             Title:


                                           VALENTEC SYSTEMS, INC.


                                           By___________________________________
                                             Name:
                                             Title:


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                                     ANNEX A

                             REVOLVING NOTE SCHEDULE


                                                   INTEREST  INTEREST   NOTED
   DATE    ADVANCE    PRINCIPAL PAID    BALANCE     ACCRUED    PAID      BY
   ----    -------    --------------    -------    --------  --------   -----











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