In carrying out subsection (a), the Secretary of Defense
may transfer periodically from the Fund
to applicable appropriations of the Department of Defense
, or to applicable appropriations of other departments or agencies, such amounts as the Secretary determines necessary to cover the costs chargeable to those appropriations for uniformed service retiree health care programs for beneficiaries under those programs who are medicare
-eligible. Such transfers may include amounts necessary for the administration of such programs. Amounts so transferred shall be merged with and be available for the same purposes and for the same time period as the appropriation to which transferred. Upon a determination that all or part of the funds
transferred from the Fund
are not necessary for the purposes for which transferred, such amounts may be transferred back to the Fund.
This transfer authority is in addition to any other transfer authority that may be available to the Secretary.