Corrected entry: The movie states that it's set 7 years after the US became involved in the war. This would make it about 1968. When Brad Johnson and the girl are dancing, the song "Rockin Pneumonia and the Boogie Woogie Flu" by Johnny Rivers was playing, which was not released until 1972.
wolfman
16th Jan 2014
Correction: The US officially became involved in 1965 not 1961...1965+7=1972.
Steve Kozak