45 CFR 506.10: “Vietnam conflict” defined.

Vietnam conflict refers to the period beginning February 28, 1961, and ending on a date to be determined by Presidential proclamation or concurrent resolution of the Congress. (For purposes of determining eligibility for certain veterans' benefits, the President has proclaimed the date of May 7, 1975, to be the ending date of the “Vietnam era” (Presidential Proclamation No. 4373, 38 U.S.C. 101 note). In addition, Congress has set May 7, 1975, as the ending date of the “Vietnam conflict” for purposes of payment of interest on missing military service members' deposits in the United States Treasury under 10 U.S.C. 1035. However, neither the President nor the Congress has set an ending date for the Vietnam conflict for purposes of determining eligibility for compensation under 50 U.S.C. App. 2004 and 2005.)