The letter also focused on a technology that some units of the Air Force and Army have used to track guns, but that could let even low-tech enemies detect U.S. Spokespeople for the Army, Marines and Air Force said the branches would respond directly to the committee. The lawmakers requested a progress briefing by Nov. “We are concerned that DOD has seemingly not yet developed a coherent strategy to improve its ability to account for military weapons and equipment,” Democratic leaders on the House Committee on Oversight and Reform wrote Defense Secretary Lloyd Austin and the leaders of the service branches in a letter dated Monday.