the yield to . Titterton and Dwyer were on hand for the shot. On 11 October 1956, Valiant B.1 WZ366 of No. 49 Squadron RAF became the first RAF aircraft to drop a live atomic bomb. It fell about left and short of the target, detonating at a height of at 15:27. The yield was . The pilot, Squadron Leader Edwin Flavell, and the bomb aimer, Flight Lieutenant Eric Stacey, were awarded the Air Force Cross in the 1957 New Year Honours. Fallout was minimal. Two clouds formed, a low-level one at about that dropped all its radioactive material inside the prohibited area, and a high-level one at that deposited a negligible amount of fallout over South Australia, Victoria and New South Wales. Test 4: Breakaway The final test, Breakaway, was of a boosted Red Beard device. The shot was conducted from a tower. Once again there were delays due to unfavourable weather that pushed it back from 18 to 22 October. It was detonated at 00:05 on 22 October, with a yield of about . As on previous tests, the fallout was measured using sticky paper, air sampling devices, and water sampled from rainfall and reservoirs. This time the cloud was tracked with the help of a Trans Australia Airlines (TAA) Douglas DC-4 diverted from its flight path. The cloud reached but soon became widely dispersed between Darwin in the Northern Territory and Newcastle in New South Wales. The highest reading recorded by the ground survey was at Ingomar, South Australia, about from the test site. Summary Operation Antler Planning and purpose The July 1956 Suez Crisis brought US-UK relations to a low ebb, rendering the prospect of the use of US facilities in the near future remote. On 20 September 1956, the UK High Commissioner informed Menzies of the UK's intention to continue minor trials in March through October 1957, with another major test series in September and October. The main implication was that the range would be in use for most of the year. A minimum of 228 personnel would be required all year round, rising to 354 from March to July, and 400 from July to October. The codename Sapphire was initially allocated to the 1957 test series, but the RAF complained that that codename had already been allocated to the Armstrong Siddeley Sapphire aircraft engine. The name was briefly changed to Volcano until the Australians