Document:

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                                                                   Exhibit 10.34

                      SECOND AMENDMENT TO CREDIT AGREEMENT

     THIS SECOND AMENDMENT TO CREDIT AGREEMENT (this "Amendment"), dated as of
December 20, 2002, is made and entered into by and among Analex Corporation, a
Delaware corporation, successor by merger to Hadron, Inc. (the "Borrower"), and
the subsidiaries of the Borrower identified on the signature pages hereto (the
"Subsidiary Guarantors"), and Bank of America, N.A., a national banking
association (the "Lender").

                                   WITNESSETH

     WHEREAS, the Borrower and the Lender entered into that certain Credit
Agreement dated as of November 2, 2001, as amended by the First Amendment to
Credit Agreement dated as of August 1, 2002 (the "Existing Credit Agreement").

     WHEREAS, the parties have agreed to amend the Existing Credit Agreement as
set forth herein.

     NOW, THEREFORE, in consideration of the agreements hereinafter set forth,
and for other good and valuable consideration, the receipt and adequacy of which
are hereby acknowledged, the parties hereto agree as follows:

                                     PART I
                                   DEFINITIONS

     1. Certain Definitions. Unless otherwise defined herein or the context
otherwise requires, the following terms used in this Amendment, including its
preamble and recitals, have the following meanings:

     "Amended Credit Agreement" means the Existing Credit Agreement as amended
hereby.

     "Amendment No. 2 Effective Date" is defined in Part III.

     2. Other Definitions. Unless otherwise defined herein or the context
otherwise requires, terms used in this Amendment, including its preamble and
recitals, have the meanings provided in the Amended Credit Agreement.

                                     PART II
                     AMENDMENTS TO EXISTING CREDIT AGREEMENT

     Effective on (and subject to the occurrence of) the Amendment No. 2
Effective Date, the Existing Credit Agreement is hereby amended in accordance
with this Part II. Except as so amended, the Existing Credit Agreement and all
other Loan Documents shall continue in full force and effect.

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     1. Amendment to Section 2.15 (a). Section 2.15 (a) of the Existing Credit
Agreement is hereby amended in its entirety to read as follows:

          (a) Borrowing Base. The "Borrowing Base" for the Borrower at any time
     shall mean the sum, at the date of the most recent Borrowing
     Base/Non-Default Certificate required to be furnished pursuant to Section
     2.15(b), of

          (i)  Ninety percent (90%) of the Net Value (as hereinafter defined) of
               Eligible Billed Receivables representing amounts due and owing
               from the Government (or from a prime contractor under a contract
               with the Government with respect to which the Borrower is a
               subcontractor), which are outstanding less than ninety-one (91)
               days from the date of original invoice; plus

          (ii) Eighty percent (80%) of the Net Value of Eligible Billed
               Receivables representing amounts due and owing from domestic
               account debtors (other than the Government), which are
               outstanding less than ninety-one (91) days from the date of
               original invoice; plus

          (iii) The lesser of (A) fifty percent (50%) of the Net Value of
               Eligible Unbilled Receivables and (B) $1,000,000.

               The "Net Value" of an Eligible Billed Receivable or an Eligible
               Unbilled Receivable shall be its face amount, net of any discount
               for prompt payment (and net of any other amount representing
               payment of finance charges, late charges, or interest (however
               denominated)), and net of any portion thereof which constitutes
               payment of sales, use or other taxes.

     2. Amendments Related to Individual Guarantors. Contemporaneous with the
execution and delivery of this Amendment, the Lender is releasing the Individual
Guarantors from their respective obligations under the Individual Guaranties.
Accordingly, Section 5.1(g)(iii), Section 5.1(g)(iv), Section 5.1(g)(v) and
Section 7.1(s) of the Existing Credit Agreement are hereby deleted in their
entirety, and the references to "Individual Guarantor" in Section 7.1(n)(i) and
Section 7.1(o) are hereby deleted. The releases of the Individual Guarantors
shall not constitute an Event of Default under Section 7.1(l) of the Existing
Credit Agreement, and the terms "Guaranties" and "Loan Documents," as defined in
Section 1.1 of the Existing Credit Agreement, shall no longer include the
Individual Guaranties.

                                    PART III
                           CONDITIONS TO EFFECTIVENESS

     1. Amendment No. 2 Effective Date. This Amendment shall be and become
effective as of the date hereof (the "Amendment No. 2 Effective Date") when all
of the conditions set forth in this Part III shall have been satisfied, and
thereafter this Amendment shall be known, and may be referred to, as "Amendment
No. 2".

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     2. Execution of Counterparts of Amendment. The Lender shall have received
counterparts of this Amendment, which collectively shall have been duly executed
on behalf of the Borrower, the Subsidiary Guarantors and the Lender.

     3. Officer's Certificate. The Lender shall have received a certificate
executed by the chief financial officer of the Borrower as of the Amendment No.
2 Effective Date stating that, immediately after giving effect to this Amendment
and the transactions contemplated hereby, (i) no Default exists and (ii) the
representations and warranties set forth in the Existing Credit Agreement are
true and correct in all material respects.

     4. Material Adverse Change. Except as otherwise previously disclosed in
writing to the Lender, no material adverse change shall have occurred since June
30, 2002 in the condition (financial or otherwise), business or management of
the Borrower and the Subsidiary Guarantors.

     5. Fees and Expenses. All out-of-pocket fees and expenses of the Lender in
connection with the Loan Documents, including this Amendment, including legal
and other professional fees and expenses incurred on or prior to the date of
this Amendment, shall have been paid.

     6. Other Items. The Lender shall have received such other documents,
agreements or information which may be reasonably requested by the Lender.

                                     PART IV
                                  MISCELLANEOUS

     1. Representations and Warranties. Borrower hereby represents and warrants
to the Lender that, after giving effect to this Amendment, (a) no Default exists
under the Amended Credit Agreement or any of the other Loan Documents which has
not been waived and (b) the representations and warranties set forth in the
Existing Credit Agreement are, subject to the limitations set forth therein,
true and correct in all material respects as of the date hereof (except for
those which expressly relate to an earlier date).

     2. Cross-References. References in this Amendment to any Part are, unless
otherwise specified, to such Part of this Amendment.

     3. Instrument Pursuant to Existing Credit Agreement. This Amendment is a
Loan Document executed pursuant to the Existing Credit Agreement and shall
(unless otherwise expressly indicated therein) be construed, administered and
applied in accordance with the terms and provisions of the Existing Credit
Agreement.

     4. References in Other Loan Documents. At such time as this Amendment shall
become effective pursuant to the terms of Part III, all references in the Loan
Documents to the "Agreement" shall be deemed to refer to the Existing Credit
Agreement as amended by this Amendment.

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     5. Counterparts. This Amendment may be executed by the parties hereto in
several counterparts, each of which shall be deemed to be an original and all of
which shall constitute together but one and the same agreement.

     6. Governing Law. THIS AMENDMENT SHALL BE DEEMED TO BE A CONTRACT MADE
UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE COMMONWEALTH OF VIRGINIA WITHOUT
GIVING EFFECT TO THE CONFLICT OF LAW PRINCIPLES THEREOF.

     7. Successors and Assigns. This Amendment shall be binding upon and inure
to the benefit of the parties hereto and their respective successors and
assigns.

                  [remainder of page intentionally left blank]

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     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly signed, sealed and delivered by their properly and duly authorized officers
as of the day and year first above-written.

                                       BORROWER:

                                       ANALEX CORPORATION

                                       By:                                (SEAL)
                                          --------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------

                                       SUBSIDIARY GUARANTORS:

                                       ADVANCED BIOSYSTEMS, INC.

                                       By:                                (SEAL)
                                          --------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------

                                       SYCOM SERVICES, INC.

                                       By:                                (SEAL)
                                          --------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------

                                       LENDER:

                                       BANK OF AMERICA, N.A.

                                       By:                                (SEAL)
                                          --------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------<PAGE>

                                                                   Exhibit 10.35

                                    AMENDMENT
                                       TO
                       ANALEX CORPORATION VOTING AGREEMENT

     This Amendment to Voting Agreement (the "Amendment") effective as of
November 1, 2002, by and among certain holders (the "Holders") (including but
not limited to John D. Sanders ("Sanders")) of the common stock, par value $.02
per share (the "Common Stock") of Analex Corporation, a Delaware corporation
formerly known as Hadron, Inc. (the "Company"), and certain Members of the
Voting Group under the Original Agreement (as defined below).

     WHEREAS, the Holders and the Members of the Voting Group are party to that
certain Voting Agreement, dated as of March 30, 2000 (the "Original Agreement"),
relating to voting as to the number and identity of the directors of the Company
and certain other matters related to the Common Stock; and

     WHEREAS, the Holders and the Members of the Voting Group desire to amend
the Original Agreement to effect the removal of Sanders as a party to the
Agreement.

     NOW THEREFORE, in consideration of the premises and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
parties hereby agree as follows (capitalized terms not otherwise defined in this
Amendment shall have the meaning given them in the Original Agreement):

     1. Effective as of the date hereof, Sanders shall no longer be a party to
the Original Agreement, and shall be released from any and all further
obligations and liabilities thereunder.

     2. All references to "Holders" under the Original Agreement shall
henceforth be deemed to exclude Sanders.

     3. Except as expressly set forth above, all other provisions of the
Original Agreement shall remain the same and in full force and effect.

                         [Signatures on following page]

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     IN WITNESS WHEREOF, and pursuant to Section 5 of the Original Agreement,
the undersigned, constituting Holders holding not less than a majority of the
shares of Common Stock held by all Holders and the Members of the Voting Group
holding not less than a majority of the shares of Common Stock held by all
Members of the Voting Group, have caused this Amendment to be executed effective
as of the date first above written.

HOLDERS:                                    VOTING GROUP MEMBERS:

-------------------------------------       ------------------------------------
John D. Sanders                             Jon M. Stout

                                            Stout Dynastic Trust

-------------------------------------       ------------------------------------
J. Richard Knop                             Jon M. Stout, Trustee

                                            ------------------------------------
                                            J. Richard Knop

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