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