Subject to paragraph (2), the Secretary of Defense may enter into one or more agreements with any person (including a foreign government, international organization, multinational entity, or any other entity) that the Secretary considers appropriate under which the person contributes funds for activities conducted under the Program.
Notwithstanding section 3302 of title 31 and subject to subsections (c) and (d), the Secretary of Defense may retain and obligate or expend funds contributed pursuant to subsection (a) for purposes of the Program. Funds so contributed shall be retained in a separate fund established in the Treasury for such purposes and shall be available to be obligated or expended without further appropriation.
If the Secretary does not obligate or expend funds contributed pursuant to subsection (a) by the date that is three years after the date on which the contribution was made, the Secretary shall return the amount to the person who made the contribution.