”Reveille! Reveille! Reveille! All hands heave out and trice up. Reveille.” The U.S. Navy’s 6 a.m. wake-up call on the USS Theodore Roosevelt marks the start of a long day that for many may seem like a repetition of the day before. But on this aircraft carrier in the Persian Gulf, every task is key to the mission of launching strikes against Islamic State militants in Iraq and Syria.