Marine Lt. Col. James Wellons checks his oxygen mask March 18, 2011, prior to an F-16 Fighting Falcon training flight at Eglin Air Force Base, Fla. Pilots from Marine Fighter Attack Training Squadron 501 will be flying the new F-35B Lightning II joint strike fighter and are training at Eglin AFB. They are flying F-16 sorties to familiarize themselves with an aircraft similar to the F-35 as well as introduce them to airspace and flightline operations. Colonel Wellons is the VMFAT-501 commander. (U.S. Air Force photo/Samuel King Jr.)