A good source of background information tracking a weapon/vehicle/system through the acquisition process to adoption.
You can find defense budget materials by fiscal year. For example:
Under the Budget Documents link on the left, you can find:
There is also a link to Budget Hearing Material and more.
The Budget of the United States Government ("President's Budget") is a large multi-volume set prepared by the Office of Management and Budget (OMB), which is the central budgeting agency that prepares the President's budget that gets submitted to Congress. Current and past budgets from 1996-present can be found on the site below
The library has these in print in the FEDDOCS area on the first floor (call number PREX 2.8:). The most recent budget is in the REFERENCE area: HJ2051/A53).
The sites below from the Defense Technical Information Center have a lot of useful defense budget information. For even more, NPS students, faculty and staff should register for the R&E Gateway using the Login/Register link on the first DTIC site listed below.