U.S. Navy Petty Officer 3rd Class John Lopes, left, a corpsman with Marine Wing Support Squadron 473, Marine Aircraft Group 41, 4th Marine Aircraft Wing, provides a patient treatment methods at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. U.S. Navy Corpsman play a significant role in Reserve Marines’ annual trainings to ensure the Reservist are healthy and able to continue their mission. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)