An F-35B Lightning II Joint Strike Fighter, Marine Fighter Attack Squadron 121, 3rd Marine Aircraft Wing, performs a conventional take-off at the Strategic Expeditionary Landing Field during Exercise Steel Knight 2016 at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 11, 2015. This year’s iteration of Exercise Steel Knight works to advance 1st Marine Division’s warfighting capabilities, to include interoperability between the ground and air forces and integration of the F-35B. - An F-35B Lightning II Joint Strike Fighter, Marine Fighter Attack Squadron 121, 3rd Marine Aircraft Wing, performs a conventional take-off at the Strategic Expeditionary Landing Field during Exercise Steel Knight 2016 at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 11, 2015. This year’s iteration of Exercise Steel Knight works to advance 1st Marine Division’s warfighting capabilities, to include interoperability between the ground and air forces and integration of the F-35B.