Vietnam War death toll.

The Virginian Pilot-newspaper from Virginia Beach, VA.-published on Memorial Day this year a listing of the number of US service personnel killed in the Vietnam War.  They list a total of 58,230 and the deaths by year as follows: 1956 to 64 = 416, 1965 = 1928, 1966 = 6350, 1967 = 11,362, 1968 = 16899, 1969 = 11,780, 1970 = 6173, 1971 = 2414, 1972 to 2006 = 897.  The article also lists those who died from the Virginia Beach area, and the first death is listed as 1961; the last death listed as 1979.  We left in 1973 and the war ended in 1975 with the North Vietnamese taking over the entire country.  Why then are there seven listed killed from the Virginia Beach area at a time when the war was supposedly over?  I wonder how many died there after 1975 from the US in all.  On further reading of the article those death were listed when they were declared dead, not when they might actually had been killed. (The Virginian Pilot on 5/25/15 "Vietnam War: Remember" (One should not jump to conclusions without all the facts considered first; a valuable lesson).