U.S. Marines with 4th Combat Engineer Battalion, 4th Marine Division, Marine Forces Reserve, fire an anti-personnel obstacle breaching system (APOB) during Integrated Training Exercise 4-24 at Marine Corps Air-Ground Combat Center Twentynine Palms, California, June 11, 2024. ITX enables the reserve component to simulate a mobilization and deploy its forces in preparation for potential future deployments in the event of a contingency or emergency. (U.S. Marine Corps Photo by Lance Cpl. Orion Stpierre)