LIFTOFF As a CH-46 Sea Knight lifts off behind him, U.S. Marine Lance Cpl. Charles E. Weber guards the perimeter of a makeshift landing zone at Centennial Middle School in Yuma, Ariz., during a simulated evacuation exercise of U.S. citizens from a foreign country in the event of a crisis, April 17, 2009. The city of Yuma allows the Marine Corps to use local parks and school sports fields as training areas. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 994649-I-FZR49-950.jpg Photo Gallery