U.S. Marines with Marine Wing Support Squadron 472, Marine Aircraft Group 49, 4th Marine Aircraft Wing fire an Mk 19 on Range 106 during Integrated Training Exercise 4-19 at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 13, 2019. Training exercises such as ITX ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Cpl. Tessa D. Watts)