A United Launch Alliance Atlas V rocket with the Air Force’s first X-37B Orbital Test Vehicle rolls out to Cape Canaveral Air Force Station’s Space Launch Complex 41 launch pad April 21, 2010, prior to its launch. OTV-2 launched March 5, 2011, and will help Air Force scientists better evaluate and understand the vehicle’s performance characteristics and expand upon the tests from OTV-1. (Courtesy photo/Pat Corkery)