Damage Controlman 2nd Class Stuart Hooper, from Little Rock, Ark., demonstrates how to properly use a self-contained breathing apparatus (SCUBA) to a group of new sailors aboard the aircraft carrier USS Nimitz (CVN 68). Nimitz recently got underway to participation in the Rim of the Pacific (RIMPAC) training exercise, the world's largest international maritime exercise. (U.S. Navy photo by Mass Communication Specialist Seaman Jess Lewis/Released)