Unlike works of the U.S. Government, works produced by contractors under government contracts are protected under U.S. Copyright Law. (See Schnapper v. Foley, 667 F.2d 102 (D.C. Cir. 1981), cert. denied, 455 U.S. 948 (1982).) The ownership of the copyright depends on the terms of the contract. Contract terms and conditions vary between civilian agencies or NASA and the military.
I'd rather buy a gumstix board and run Paparazzi. The project looks really cool, and open source hardware schematics and software is available.