Col. William H. Vivian, commanding officer, and Col. Jay M. Bargeron, former commanding officer, 7th Marine Regiment, conduct a pass in review during the regiment’s change of command ceremony at Torrey L. Gray Field, Dec. 18, 2015. (Official Marine Corps photo by Lance Cpl. Thomas Mudd/Released) - Col. William H. Vivian, commanding officer, and Col. Jay M. Bargeron, former commanding officer, 7th Marine Regiment, conduct a pass in review during the regiment’s change of command ceremony at Torrey L. Gray Field, Dec. 18, 2015. (Official Marine Corps photo by Lance Cpl. Thomas Mudd/Released)

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 aboard the Combat Center, 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. (Official Marine Corps photo by Lance Cpl. Levi Schultz/Released) - 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 aboard the Combat Center, 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. (Official Marine Corps photo by Lance Cpl. Levi Schultz/Released)