Graham watched this chaos for a moment, before he quietly reached into his desk and pulled out a tin whistle. Taking a deep breath, he gave it a blast that made the pilots' ears ring. "Are you all quite finished now?" he enquired blandly. "You are? Good. Now, since I've updated you on the local situation, it's now time to sort out the duty roster. I don't know how your last unit operated," he said to O'Hare and Beurling, "But here in the 501st, we've found that the best system is a paired patrol; two Witches in the air, while the next two are on standby, ready to take off." he informed them.