Department of Defense authorization for appropriations for fiscal year 2018 and the Future Years Defense Program : hearings before the Committee on Armed Services, United States Senate, One Hundred Fifteenth Congress, first session, on S. 1519, to authorize appropriations for fiscal year 2018 for military activities of the Department of Defense, for military construction, and for defense activities of the Department of Energy, to prescribe military personnel strengths for such fiscal year, and for other purposes.