Hearings on National Defense Authorization Act for fiscal year 1991--H.R. 4739 and oversight of previously authorized programs before the Committee on Armed Services, House of Representatives, One Hundred First Congress, second session : Procurement and Military Nuclear Systems Subcommittee hearings on procurement of aircraft, missiles, weapons and tracked combat vehicles, ammunition, and other procurement : hearings held March 15, 16, and 20, 1990.