Hearings on National Defense Authorization Act for fiscal year 1990--H.R. 2461 and oversight of previously authorized programs before the Committee on Armed Services, House of Representatives, One Hundred First Congress, first session : Research and Development Subcommittee hearings on research, development, test, and evaluation : hearings held February 23, 28, March 2, 7, 9, 14, 15, 21, 22, and 23, 1989