
ALT A U.S. Marine with Charlie Company, 3d Light Armored Reconnaissance Battalion, 1st Marine Division prepares to shoot a mounted M240B medium machine gun during a close air support exercise as part of Weapons and Tactics Instructor course 1-27 at Yuma, Arizona, Oct. 19, 2026. WTI is a seven-week training event hosted by Marine Aviation Weapons and Tactics Squadron One which emphasizes operational integration of the seven functions of Marine aviation in support of the Marine Air Ground Task Force, Joint and Coalition Forces. (U.S. Marine Corps Photo by Sgt. Calah Thompson)

ALT U.S. Marine Corps Cpl. Nathan Dierenfeild, a light armored vehicle commander with Charlie Company, 3d Light Armored Reconnaissance Battalion, 1st Marine Division, zeroes a mounted M240B medium machine gun during a close air support exercise as part of Weapons and Tactics Instructor course 1-27 at Yuma, Arizona, Oct. 19, 2026. WTI is a seven-week training event hosted by Marine Aviation Weapons and Tactics Squadron One which emphasizes operational integration of the seven functions of Marine aviation in support of the Marine Air Ground Task Force, Joint and Coalition Forces. Derifield is a native of Montana. (U.S. Marine Corps Photo by Sgt. Calah Thompson)

























