Heat pulses off the flightline as Royal Air Force pilot, Squadron Leader Hugh Nichols, taxis a Marine F-35B Lightning II toward the runway for the first short take-off and vertical landing sortie by a United Kingdom pilot at Eglin Air Force Base, Fla., Feb. 25. The U.S. Marines began flying STOVL sorties at Eglin in October 2013. (U.S. Air Force photo/Samuel King Jr.)