Shall we walk you through it AGAIN?
The Navy contract was pursuant to a Navy solicitation and began and ended with a Navy contracting agent. After the award of the NAVY contract, only the administrative payment office changed. THAT is the modification you are citing. It has nothing/zero/bupkiss to do with any "Army contract".
Can you grock that simple fact in your chump mind?
Demmo>>Your post stated Modification P00001 made changes to SF-26, Block 12. Block 12 is “Payment Will Be Made By”. P00001 made an administrative change to the original award document (SF-26) revising which office is to make contract payments. The deleted payment office was originally provided as a USACE payment office – this was not a USACE contract, it was a Navy contract. A clerk likely made a bad entry or was provided a bad code. Whatever, P00001 fixed that and corrected that the payments should be coming from a DFAS (Defense Finance and Accounting Service) office not a USACE payment office. Its not an uncommon thing to make these kind of administrative changes.
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