Lightning at Sunset An F-35B Lightning II sits as the sun sets on Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 10, 2015. The aircraft is participating in Exercise Steel Knight, an integrated live-fire exercise with the 1st Marine Division. U.S. Marine Corps photo by Cpl. Cameron Storm SHARE: Download: Full Size (1.17 MB) Tags: Marines, Exercise Steel Knight, usmc, Marine Corps Air Ground Combat Center Twentynine Palms, Lead Photos, 1st marine division, Lightning II, F-35B Lightning II, F-35B, All images, Marine Corps Credit: Cpl. Cameron Storm VIRIN: 151210-M-FO813-011.JPG Photo Gallery