A U.S. Marine aircraft rescue and firefighting specialist with Marine Wing Support Squadron 471, Marine Aircraft Group 41, 4th Marine Aircraft Wing, holds a door open while Marines extinguish a fire in a burning room during combined firefighting training at Canadian Forces Base Cold Lake, Canada, June 16, 2019, in support of Sentinel Edge 19. The Marine Reserve plays a critical component to the Marine Corps’ Total Force, and training such as SE19 helps ensure Reserve units combat effectiveness and proficiency for world-wide deployment. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)