U.S. Marine Lance Cpl. David Charbonneau, a military policeman with Marine Wing Support Squadron 472, Marine Aircraft Group 49, 4th Marine Aircraft Wing mounts an Mk 19 grenade launcher on Range 106 during Integrated Training Exercise 4-19 at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., June 13, 2019. ITX is an essential component of the Marine Forces Reserve training cycle. It serves as the principal exercise for assessing a unit’s readiness. (U.S. Marine Corps photo by Cpl. Tessa D. Watts)