Summary of External Doses for Operation HARDTACK I as of 1 May 1986 Gamma Dose (rem) 0-0.5 0.5-1 Army 249 258 Navy 5,307 Air Force 3-5 5-10 10+ 1,011 54 2 0 2,746 1,656 26 1 0 1,561 474 1,825 183 73 7 Marine Corps 60 99 56 4 0 0 Civilian DOD Participants 65 34 66 3 0 0 4.16 1-3 OPERATION ARGUS. ' ARGUS, the code name for the only atmospheric nuclear test operation in the Atlantic Ocean, consisted of the three high-altitude, low-yield detonations identified below. The nuclear devices were lifted to about a 300-mile altitude by rockets fired from the missile trials ship USS Norton Sound (AVM-1), one of the nine ships participating in the series (20: 1). The operation was based in the Atlantic at about 45° south latitude. The location placed the task force outside regular shipping lanes but kept the launch well within the range of U.S. military forces required for support of ARGUS scientific projects (20: 19). Event Date Type ARGUS I 27 August Rocket 1-2 ARGUS II 30 August Rocket 1-2 Rocket 1-2 ARGUS III 6 September 123 Yield (kilotons)