Department of Defense Appropriations Act, 2020 This bill provides FY2020 appropriations to the Department of Defense (DOD) for military activities. The bill excludes military construction, military family housing, civil works projects of the Army Corps of Engineers, and nuclear warheads, which are all considered in other appropriations bills. Within the DOD budget, the bill provides appropriations for Military Personnel; Operation and Maintenance; Procurement; Research, Development, Test and Evaluation; and Revolving and Management Funds. The bill provides appropriations for Other Department of Defense Programs, including the Defense Health Program, Chemical Agents and Munitions Destruction, Drug Interdiction and Counter-Drug Activities, and the Office of the Inspector General. The bill provides appropriations for (1) Related Agencies, including the Central Intelligence Agency Retirement and Disability System Fund and the Intelligence Community Management Account; and (2) Overseas Contingency Operations/ Global War on Terrorism. The bill also includes provisions that repeal the 2001 Authorization for Use of Military Force after 240 days; prohibit funds from being used to construct a wall, fence, border barriers, or border security infrastructure along the southern land border of the United States; prohibit funds from being used to deliver F-35 air vehicles or other F-35 weapon system equipment to Turkey; and direct the President to remove the Armed Forces from hostilities in or affecting Yemen unless a declaration of war or specific authorization has been enacted, with certain exceptions.