1955 - Nevada Test Site
Operation Storax was the second fiscal year based "test series", running from 1 July 1962 and through 30 June 1963. This series was concluded before the signing of the Atmospheric Test Ban Treaty on 5 August 1963, and included the last U.S. atmospheric tests of any description (the last zero-yield plutonium dispersal test Roller Coaster Clean Slate III was fired 9 June 1963).
Storax included several Plowshare tests, including the spectacular (and thus very well known) Sedan shot. These tests were intended to develop nuclear explosives for non-military uses.