. All operations during the practice test were carried out in the manner planned for the conduct of the actual tests. It was a complete rehearsal with no omissions except the firing of the actual shot, which at H-hour was simulated by the firing of flash bulbs. Weather briefings for the Commander and the Test and Scientific Directors were held on PX–1 and at 0245 on PX Day, 8 April, an informal briefing was presented. At 0445 a final formal briefing was given and the final] decision to go ahead was made. All air and naval operations were accomplished in coordination with the movement and actions of units of Task Group 7.1. The placement of a practice bomb in the tower on Engebi Island, and the enactment of the step-by-step procedure of the firing party under Dr. Graves, The Deputy Scientific Director, served to heighten the realism of the practice run. This rehearsal was a test of Joint Task Force plans. A general critique was held on 10 April attended by appropriate Commanders, The Test and Scientific Directors, and Staff officers. Minor changes and adjustments were made as a result of this critiqu ‘. Satisfied that the Task Force was ready, General Hull gave the decision th the first test would proceed as scheduled. / . 124 . ‘