U.S. Marines with the Bravo Company, 7th Engineer Support Battalion, 1st Marine Logistics Group, build a body bomb charge, designed to blow a person-sized hole in a doorway for quick entry during urban breaching training at Camp Pendleton, Calif., Nov. 17, 2016. The Marines with 7th ESB were put into fire teams and tasked to build explosive devices such as a hinge charges, water charges and body charges to forcefully open a locked door. (U.S. Marine Corps Photo by Lance Cpl. Joseph Sorci) - U.S. Marines with the Bravo Company, 7th Engineer Support Battalion, 1st Marine Logistics Group, build a body bomb charge, designed to blow a person-sized hole in a doorway for quick entry during urban breaching training at Camp Pendleton, Calif., Nov. 17, 2016. The Marines with 7th ESB were put into fire teams and tasked to build explosive devices such as a hinge charges, water charges and body charges to forcefully open a locked door. (U.S. Marine Corps Photo by Lance Cpl. Joseph Sorci)

U.S. Navy Petty Officer 2nd Class Michael Mathews helps to set up a grey water sanitation soakage pit during Preventative Medicine Exercise 2016 at Camp Pendleton, Calif., Nov. 10, 2016. The pit is 5 feet long, 5 feet wide, and 5 feet deep filled with small rocks and pipes to safely transfer waste to the ground. Grey water is any substance that could potentially be harmful to the environment and special precautions are made to keep the exercise’s area safe. Matthews is a preventive medical technician with 1st Medical Battalion, 1st Marine Logistics Group. (U.S. Marine Corps photo by Lance Cpl. Joseph Sorci) - U.S. Navy Petty Officer 2nd Class Michael Mathews helps to set up a grey water sanitation soakage pit during Preventative Medicine Exercise 2016 at Camp Pendleton, Calif., Nov. 10, 2016. The pit is 5 feet long, 5 feet wide, and 5 feet deep filled with small rocks and pipes to safely transfer waste to the ground. Grey water is any substance that could potentially be harmful to the environment and special precautions are made to keep the exercise’s area safe. Matthews is a preventive medical technician with 1st Medical Battalion, 1st Marine Logistics Group. (U.S. Marine Corps photo by Lance Cpl. Joseph Sorci)

A CH-53E Super Stallion, with Marine Heavy Helicopter Squadron 466, hovers to pick up a 500-gallon drum of water from U.S. Marines with Combat Logistics Battalion 15, 1st Marine Logistics Group and 3rd Battalion, 4th Marine Regiment, 1st Marine Division during a Helicopter Support Team drill at Mountain Warfare Training Center, Bridgeport, Calif., Oct. 25, 2016. The drum was taken into the Sierra Mesa Mountains to support Marines who are conducting field operations during Mountain Exercise 6-16. (U.S. Marine Corps photo by Lance Cpl. Adam Dublinske) - A CH-53E Super Stallion, with Marine Heavy Helicopter Squadron 466, hovers to pick up a 500-gallon drum of water from U.S. Marines with Combat Logistics Battalion 15, 1st Marine Logistics Group and 3rd Battalion, 4th Marine Regiment, 1st Marine Division during a Helicopter Support Team drill at Mountain Warfare Training Center, Bridgeport, Calif., Oct. 25, 2016. The drum was taken into the Sierra Mesa Mountains to support Marines who are conducting field operations during Mountain Exercise 6-16. (U.S. Marine Corps photo by Lance Cpl. Adam Dublinske)