Pains, gains, and bike chains: U.S. Marine Corps wounded warrior gives back to injured brothers and sisters-in-arms - Retired U.S. Marine Corps Master Sgt. Fernando Andrade, a volunteer and bicycle technician with Wounded Warrior Battalion-West, Wounded Warrior Regiment, installs a tire on a bicycle on Marine Corps Base Camp Pendleton, Calif., April 17, 2018. Throughout the year, athletes with the unit compete in the Marine Corps Trials, the Department of Defense Warrior Games, and cycling tours in San Diego; therefore Andrade’s maintenance is vital to each competitors’ success. (U.S. Marine Corps photo by Lance Cpl. Dalton Swanbeck)

Marines with Weapons Company, 1st Battalion, 1st Marine Regiment, 1st Marine Division, conduct medical evacuation techniques inside the Camp Pendleton Infantry Immersion Trainer, April 7. The 32,000-square-foot military urban training facility was recently changed from a simulated Iraqi village to a replica of the Afghan village, Now Zad, after the Headquarters Marine Corps officials made the decision March 15, to modify the training environment. - Marines with Weapons Company, 1st Battalion, 1st Marine Regiment, 1st Marine Division, conduct medical evacuation techniques inside the Camp Pendleton Infantry Immersion Trainer, April 7. The 32,000-square-foot military urban training facility was recently changed from a simulated Iraqi village to a replica of the Afghan village, Now Zad, after the Headquarters Marine Corps officials made the decision March 15, to modify the training environment.