Based on the limited information provided, I will provide guidance.  First the National Defense Authorization Act does not grant budget authority to the Department of Defense.  Next, you need to review the budget exhibits to see if this requirement was included and budget authority was asked for within the budget exhibits.  I strongly recommend that you review the GAO Red Book, Chapter 3, Availability of Appropriations: Purpose, and the Financial Management Regulation (FMR) 7000.14-R Volume 2A.  I also recommend that you speak with the BFM, Funds Certifier, and legal office, you may need to get in touch with the Army Comptroller office, also.  I would try to get this decision in writing so you can apply it consistently year to year.