50 USC 2201 - Transfers of spoils of war

(a) Eligibility for transfer 
Spoils of war in the possession, custody, or control of the United States may be transferred to any other party, including any government, group, or person, by sale, grant, loan or in any other manner, only to the extent and in the same manner that property of the same type, if otherwise owned by the United States, may be so transferred.
(b) Terms and conditions 
Any transfer pursuant to subsection (a) of this section shall be subject to all of the terms, conditions, and requirements applicable to the transfer of property of the same type otherwise owned by the United States.

50 USC 2202 - Prohibition on transfers to countries which support terrorism

Spoils of war in the possession, custody, or control of the United States may not be transferred to any country determined by the Secretary of State, for purposes of section 2780 of title 22, to be a nation whose government has repeatedly provided support for acts of international terrorism.

50 USC 2203 - Report on previous transfers

Not later than 90 days after April 30, 1994, the President shall submit to the appropriate congressional committees a report describing any spoils of war obtained subsequent to August 2, 1990 that were transferred to any party, including any government, group, or person, before April 30, 1994. Such report shall be submitted in unclassified form to the extent possible.

50 USC 2204 - Definitions

As used in this chapter
(1) the term appropriate congressional committees means the Committee on Foreign Relations of the Senate and the Committee on Foreign Affairs of the House of Representatives, or, where required by law for certain reporting purposes, the Select Committee on Intelligence of the Senate and the Select[1] Committee on Intelligence of the House of Representatives;
(2) the term enemy means any country, government, group, or person that has been engaged in hostilities, whether or not lawfully authorized, with the United States;
(3) the term person means
(A) any natural person;
(B) any corporation, partnership, or other legal entity; and
(C) any organization, association, or group; and
(4) the term spoils of war means enemy movable property lawfully captured, seized, confiscated, or found which has become United States property in accordance with the laws of war.
[1] So in original. Probably should be preceded by “Permanent”.

50 USC 2205 - Construction

Nothing in this chapter shall apply to
(1) the abandonment or failure to take possession of spoils of war by troops in the field for valid military reasons related to the conduct of the immediate conflict, including the burden of transporting such property or a decision to allow allied forces to take immediate possession of certain property solely for use during an ongoing conflict;
(2) the abandonment or return of any property obtained, borrowed, or requisitioned for temporary use during military operations without intent to retain possession of such property;
(3) the destruction of spoils of war by troops in the field;
(4) the return of spoils of war to previous owners from whom such property had been seized by enemy forces; or
(5) minor articles of personal property which have lawfully become the property of individual members of the armed forces as war trophies pursuant to public written authorization from the Department of Defense.