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Figure 11. Task Group 1.5 organization, Operation CROSSROADS.

runs. It also operated two B-29s that dropped pressure gauges during each test. In addition, after each detonation it tracked the radioactive clouds and sampled air around the clouds. The unit was based on Kwajalein Island.

TASK UNIT 1.5.2 (ARMY AIR PHOTOGRAPHIC UNIT). TU 1.5.2 conducted air photographic operations and furnished aircraft for radiological reconnaissance flights. It was stationed on Kwajalein Island.

TASK UNIT 1.5.3 (INSTRUMENTATION AND TEST REQUIREMENTS UNIT). TU 1.5.3 and TU 1.5.6 (Army Drone Unit) were combined before the operation began. It was responsible for providing the B-17 drone and B-17 drone-controller aircraft for cloud-sampling operations. The drone mission required that the unit provide and maintain special equipment for sampling and for drone control operations. This included special cameras mounted in the drones. This unit was located on Enewetak Island.

TASK UNIT 1.5.4 (AIR TRANSPORT UNIT). TU 1.5.4 provided airlift for personnel, supplies, and equipment between Roswell Army Air Field, New Mexico, and the Pacific Test Area. It also provided air shuttle service among Kwajalein, Bikini, and Enewetak islands. Both C-46s and C-54s were available. This unit, stationed on Kwajalein Island, was responsible to assist in evacuating Enewetak Island in case of radiological danger to personnel on that island.

TASK UNIT 1.5.5 (AIR SERVICE UNIT). TU 1.5.5 serviced and maintained Army aircraft at Kwajalein Island. In addition to service and maintenance personnel, the task unit had engineers, military policemen, and weather-forecasting personnel.

TASK UNIT 1.5.7 (ARMY AIR WEATHER RECONNAISSANCE UNIT). TU 1.5.7 had three WB-29 aircraft with crews trained in weather reconnaissance. It flew long-range weather reconnaissance missions before each test. This unit was located on Kwajalein Island.

TASK UNIT 1.5.8 (AIR ORIENTATION UNIT). TU 1.5.8, based on Kwajalein Island, was responsible for accommodating visitors, observers, the press, and

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