appropriations made available to the Department of the Army, to be merged with and to 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), $107,900,000, to remain available until September 30, 2018. 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, $324,600,000, to remain available until September 30, 2019. Operation and Maintenance, National Defense Restoration Fund (including transfer of funds) In addition to amounts provided elsewhere in this Act, there is appropriated $5,000,000,000, for the Operation and Maintenance, National Defense Restoration Fund : Provided, That such funds provided under this heading shall only be available for programs, projects and activities necessary to implement the 2018 National Defense Strategy: Provided further, That such funds shall not be available for transfer until 30 days after the Secretary has submitted, and the congressional defense committees have approved, the proposed allocation plan for the use of such funds to implement such strategy: Provided further, That such allocation plan shall include a detailed justification for the use of such