 The Dew I releases were from a Navy minesweeper, the .Dew II involved the release of fluorescent particles (zinc cadmium sulfide) and plant spores ("Lycopodium") from an aircraft.Dew II was described in a 1953 Army report which remained classified at the time of a 1997 report by the U.S. National Research Council concerning the U.S. Army's zinc cadmium sulfide dispersion program of the 1950s.