Two CH-53E Super Stallions take off during section Confined Area Landings board Marine Corps Base Camp Pendleton, Calif., Dec. 2, 2015. (Lillian Stephens/U.S. Marine Corps)

Sgt. Kevin S. Kuykendall, a light armored vehicle crewman with Light Armored Reconnaissance Company, Battalion Landing Team 2nd Battalion, 6th Marines, 26th Marine Expeditionary Unit, cleans an LAV engine aboard the amphibious assault ship USS Kearsarge Dec. 4, 2015. (Joshua Brown/U.S. Marine Corps)

1st Battalion, 1st Marine Regiment infantrymen tactically move from building to building in a simulated combat zone during Exercise Steel Knight 2016 at Marine Corps Base Camp Pendleton, Calif., Dec. 4, 2015. (Justin Boling/U.S. Marine Corps)

Marines with Battery I, 3rd Battalion, 11th Marine Regiment, 1st Marine Division, fire an M777 Howitzer during the opening day of live-fire operations for Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., on Dec. 10, 2015. (Cameron Storm/U.S. Marine Corps)

Marines fire a High-Mobility Artillery Rocket System in support of Steel Knight at Marine Corps Base Camp Pendleton, Calif., Dec. 4, 2015. (William Perkins/U.S, Marine Corps)

A Uganda People?s Defense Force soldier detonates an "oval charge" on desired entry point during a breaching exercise at Camp Singo, Uganda, Dec. 8, 2015. (Olivia McDonald/U.S. Marine Corps)

Thomas Streeter, lead instructor of Homeland Security Solutions Inc. at Marine Corps Logistics Base Barstow, Calif., sprays Sgt. Gratia Akakpo with oleoresin capsicum, or pepper spray, during the MCLB security augmentation force training Dec. 8, 2015. (Carlos Guerra/U.S. Marine Corps)

U.S. Marines with Combined Arms Company, Black Sea Rotational Force, conduct field training with Romanian and Moldovan armed forces during Platinum Lynx 16-2 at Smardan Training Area, Romania, Dec. 9, 2015. (Melanye Martinez/U.S. Marine Corps)

Exercise Steel Knight is the first time the F-35B Lightining II is participating in an integrated live fire exercise with the 1st Marine Division. (Cameron Storm/U.S. Marine Corps)