An F-35B Lightning II assigned to VMFA-121 conducts a vertical landing at Red Beach on December 10, 2015.

Marines hook up a hose for a power cart before a weapons functional test during Exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, California.

An avionics technician assigned to VMFA-121 performs a weapons functional test on an F-35B Lightning II at Twentynine Palms.

An F-35B Lightning II performs a conventional take-off at the Strategic Expeditionary Landing Field at Twentynine Palms SELF on December 11,2015.