Warrington, the destroyer escorts USS Courtney and USS Hammerberg, the fleet oilers USS Neosho and USS Salamonie, and the seaplane tender USS Albemarle (20: 1). 4.16.3 Dose Summary for Operation ARGUS. The detonations occurred at such distances above the earth that the possibilities of personnel exposures to ionizing radiation were considered remote. The recorded doses were, in fact, so low as to be negligible. The highest level recorded by the 264 film badges distributed to the task force was 0.010 rem. The highest level recorded, 0.025 rem, was by a control film badge, which was not issued to personnel but remained in storage ina radiation-free area within a ship. Another control badge read 0.020 rem. These readings were so low that they probably were spurious and the result of environmental effects on film emulsions (20: 1,2). 4.17 OPERATION HARDTACK IT. ‘ HARDTACK II was the continental phase of Operation HARDTACK. The oceanic phase, HARDTACK I, was conducted in the Pacific from 28 April through 18 August 1958, as noted in section 4.15. Phase II, conducted at the Nevada Test Site from 12 September through 31 October 1958, consisted of 19 nuclear weapons tests and 18 safety experiments (21: 1). discusses the safety experiments. The next section, 4.18, This section concentrates on the weapons- related tests, identified in the accompanying table. Operation HARDTACK II Nuclear Events, 1958 Event Date Type EDDY 19 September Balloon 0.083 MORA 29 September Balloon 2 8 October Tunnel 0.072 QUAY 10 October Tower 0.079 LEA 13 October Balloon 1.4 HAMILTON 15 October Tower 0.0012 TAMALPAIS 125 Yield (kilotons)