Pub. L. 93-50, tit. III, sec. 307

Sec. 307. None of the funds herein appropriated under this Act may be expended to support directly or indirectly combat activities in or over Cambodia, Laos, North Vietnam and South Vietnam or off the shores of Cambodia, Laos, North Vietnam and South Vietnam by United States forces, and after August 15, 1973, no other funds heretofore appropriated under any other Act may be expended for such purpose.