EXHIBIT 10.3.6 ANALEX CORPORATION AMENDED AND RESTATED REVOLVING CREDIT FACILITY NOTE

EXHIBIT 10.3.6

ANALEX CORPORATION

AMENDED AND RESTATED REVOLVING CREDIT FACILITY NOTE

THIS REVOLVING CREDIT FACILITY NOTE (this “Note”) is made this 28 ^th day of May, 2004, by the ANALEX CORPORATION , a Delaware corporation, formerly known as Hadron, Inc., for the benefit of BANK OF AMERICA, N.A ., a national banking association (the “Lender”).

RECITALS

A.    The Borrower obtained from the Lender, among other things, a revolving credit facility in the current maximum principal sum of $8,000,000 (the “ Original Credit Facility ”). The revolving credit facility was evidenced by a Revolving Credit Facility Note dated August 1, 2002 (the “ Original Note ”).

B.    Advances and readvances under the Original Credit Facility have been governed by the terms and conditions of the Credit Agreement by and between the Borrower and the Lender dated November 2, 2001, as amended from time to time (the “ Original Financing Agreement ”). The Original Financing Agreement is being amended and restated pursuant to the Amended and Restated Credit Agreement of even date herewith (as amended, modified, restated, substituted, extended or renewed at any time and from time to time, the “ Credit Agreement ”).

C.    The Borrower has applied to the Lender to increase the revolving loan portion of the Original Credit Facility to $20,000,000, and to modify certain terms and conditions of the Original Financing Agreement and the Lender has agreed on the condition, among others, that the Original Note be amended and restated in its entirety and increased.

E.    All defined terms used in this Note and not defined herein shall have the meaning given to such terms in the Credit Agreement.

NOW, THEREFORE, in order to induce the Lender to increase the credit facilities to the Borrower, th