Soldiers Prepare Animals For Testing During Operation Crossroads

The video discusses the preparation of 150 goats with haircuts and protective ointment as a preliminary measure. The fate of surviving animals is under study, which may take months to fully understand. On the flagship Mackinley, signal flags are raised as Vice Admiral Blandy checks the time, marking the start of operations involving 40,000 men.

What does 'H hour for a day' refer to in the context of the naval operation?

Who is checking the time aboard the flagship Mackinley?