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Figure 10. Task Group 1.4 organization, Operation CROSSROADS.

ships after the tests when ships were radiologically cleared and safe for boarding (Reference C.9.149, p. 3). TG 1.4 was composed of a headquarters and the following six operating task units:


 * TU 1.4.1 (Engineer Unit)


 * TU 1.4.2 (Signal Unit)


 * TU 1.4.3 (Ordnance Unit)


 * TU 1.4.4 (Chemical Unit)


 * TU 1.4.5 (Quartermaster Unit)


 * TU 1.4.6 (Air Unit).

Task Group 1.5 (Army Air Group)

TG 1.5, the Army Air Group, composed of provisional Army Air Forces units, was assigned the mission of dropping the ABLE weapon on the target array in Bikini Lagoon. In addition, it furnished aircraft, facilities, and crews for photography, weather reconnaissance, air-sea rescue, cloud sampling, pressure gauge drops, and air transport. Table 2 lists the Army aircraft used during CROSSROADS. B-29s and F-13s, which were modified B-29s, have become intermingled at some points in the historical accounts of Army Air Group operations. The totals for each shown here are correct by most accounts. TG 1.5 was composed of the following 10 task units (as shown in Figure 11).

TASK UNIT 1.5.1 (TACTICAL OPERATIONS UNIT). TU 1.5.1 trained crews, prepared equipment for the tests, airdropped the test ABLE weapon, set up the air search radar in the Bikini area, and provided radar analyses of practice bomb

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