Locals and Marines stand in front of the monument on Hamahiga Island, Okinawa, Japan, June 23, 2018. The locals of Hamahiga hold an annual memorial service for all those who passed away during the battle of Okinawa, which ended in 1945. (U.S. Marine Corps photo by Lance Cpl. Nathan Maysonet) - Locals and Marines stand in front of the monument on Hamahiga Island, Okinawa, Japan, June 23, 2018. The locals of Hamahiga hold an annual memorial service for all those who passed away during the battle of Okinawa, which ended in 1945. (U.S. Marine Corps photo by Lance Cpl. Nathan Maysonet)

U.S. Navy Lt. Terrance Leighton, a diving medical officer with 3rd Reconnaissance Battalion, 3rd Marine Division, explains the basic operations of the compression chamber on Camp Schwab, Okinawa, Japan on June 13, 2018. The compression chamber is used to help treat service members with water pressure injures. Becoming a diving medical officer requires on average nine years of pipeline training before a candidate is ready to operate in the fleet. Leighton is a native of Boise, Idaho and an alumni of Michigan State University. (U.S. Marine Corps photo by Lance Cpl. Cameron Parks) - U.S. Navy Lt. Terrance Leighton, a diving medical officer with 3rd Reconnaissance Battalion, 3rd Marine Division, explains the basic operations of the compression chamber on Camp Schwab, Okinawa, Japan on June 13, 2018. The compression chamber is used to help treat service members with water pressure injures. Becoming a diving medical officer requires on average nine years of pipeline training before a candidate is ready to operate in the fleet. Leighton is a native of Boise, Idaho and an alumni of Michigan State University. (U.S. Marine Corps photo by Lance Cpl. Cameron Parks)