- oe Pre fand post shot crater survey photography wasmade clear detonations during the test. Aerial photography of many of the detonations was included in the program and much miscellaneous aerial photo-~ graphy was done, such as photography of B-57's and the B-52 in flight and silhouetted against a nuclear detonation, shots of Naval vessels and Navy jet fighters in flight. The largest shot participation for this element was on the underwater shots WAHOO and UNBRELLA. On these shots all five (5) of the Aerial Photo Element aircraft participated. With the completion of the UMBRELLAshot, the participation of the RB-50's was completed and on 11 June they departed the EPG, On 22 June, one (1) C-S\, was returned to Clark AFB, After the ELDER shot another C-5 was returned to Palm Beach AFB on 30 June. One (1) C5, was retained for use in aerial photography and airlift until after the last shot. Figure 12 gives a summary of flying activities of the C-5) air- craft of this element and Figure 13 gives a similar summary of the flying activities of its RB-S0's, This chapter has described the missions and the participation of test aircraft in Operation HARDTACK. series yet held, This operation was the largest nuclear test During the Operational phase, 33 nuclear detonations were held in the Eniwetok Proving Ground and two (2) at Johnston Island. Test aircraft, under the operational control of Task Group 7.h, participated in every test shot in the operation in support of many scientific projects. The aircraft had many various missions but could be categorized into four (4) different types of missions: 1. Samplers, whose missions was to collect particulate and gaseous samples from the nuclear cloud. 2. Effects aircraft, whose mission was to aid in the study of the effects of nuclear explosions on ian structures, AFWLSHO 100 ag it