Military procurement authorizations for fiscal year 1968 : hearings before the Committee on Armed Services and the Subcommittee on Department of Defense of the Committee on Appropriations, United States Senate, Ninetieth Congress, first session, on S. 666, a bill to authorize appropriations during the fiscal year 1968 for procurement of aircraft, missiles, naval vessels, and tracked combat vehicles, and research, development, test, and evaluation for the armed forces, and for other purposes, January 25, 26, 28, 30, 31, February 1, and 2, 1967