I'm not positive towrite, but - I took a class on government contracting last year and the teacher was a former air force guy. He described this fiscal deadline process in the fall that he just told as an informative and interesting story so I didn't take notes or anything.
He said that on the deadline day for applying funding to contracts, the air force (and each government entity armed forces or not) will have people whose job it is to take the dollars designated by congress and apply that funding to specific programs and contracts for the next year. For some reason it is all very last minute, but I forget why. The people on the east coast fund like mad until their midnight deadline, then the people in Central time fund like mad, then mountain and pacific, because they are trying to apply all the dollars designated for them to all their programs before the deadline. Weird eh? I remember the deadline was in the fall and it must be the one you have in mind. It may well be that they don't know for sure what their dollars are until the $ is secured in place. But that is as much as I know!