Wartime necessity is the DOD Trump card as far as emergency purchase via supplemental appropriation. You are correct about the FY 1 July date. 1 Oct also comes into play as does 1 Jan. for contracting officer's consideration. The problem is that last five (count em)CRs have gummed up the works of the acquisition cycle forcing Departments & Agencies to march in place. The bottom line is that politics, not operational necessity has thrown sand into the procurement pipeline gearbox!