be available for the same purposes and for the same time period as the appropriations to which transferred: Provided further , That upon a determination that all or part of the funds transferred from this appropriation are not necessary for the purposes provided herein, such amounts may be transferred back to this appropriation: Provided further , That the transfer authority provided under this heading is in addition to any other transfer authority provided elsewhere in this Act. Overseas humanitarian, disaster, and civic aid For expenses relating to the Overseas Humanitarian, Disaster, and Civic Aid programs of the Department of Defense (consisting of the programs provided under sections 401, 402, 404, 407, 2557, and 2561 of title 10, United States Code), $117,663,000, to remain available until September 30, 2020. Cooperative threat reduction account For assistance, including assistance provided by contract or by grants, under programs and activities of the Department of Defense Cooperative Threat Reduction Program authorized under the Department of Defense Cooperative Threat Reduction Act, $350,240,000, to remain available until September 30, 2021. department of defense acquisition workforce development fund For the Department of Defense Acquisition Workforce Development Fund, $400,000,000 (reduced by $2,100,000), to remain available for obligation until September 30, 2020: Provided , That no other amounts may be otherwise credited or transferred to the Fund, or deposited into the Fund, in fiscal year 2019 pursuant to section 1705(d) of title 10, United States Code. III Procurement Aircraft procurement, army For construction, procurement, production, modification, and modernization of aircraft, equipment, including ordnance, ground handling equipment, spare parts, and accessories therefor