U.S. Marine Corps Lance Cpl. Aaron Duran, left, and Lance Cpl. Juan Hilario, both machine gunners with 1st Battalion, 6th Marines, forward deployed with 4th Marine Regiment, 3rd Marine Division as part of the Unit Deployment Program, fire on simulated adversary forces with an M240B machine gun while conducting platoon attacks in an urban environment during Korea Viper 26.1 at Camp Rodriguez, South Korea, Dec. 17, 2025. Korea Viper is a recurring exercise series that demonstrates the Republic of Korea and U.S. Marine Corps' ability to respond decisively in the region as a singular, unified force while strengthening relationships and trust between the two allies. Duran is a native of California, and Hilario is a native of Illinois. (U.S. Marine Corps photo by Cpl. John Simpson) - U.S. Marine Corps Lance Cpl. Aaron Duran, left, and Lance Cpl. Juan Hilario, both machine gunners with 1st Battalion, 6th Marines, forward deployed with 4th Marine Regiment, 3rd Marine Division as part of the Unit Deployment Program, fire on simulated adversary forces with an M240B machine gun while conducting platoon attacks in an urban environment during Korea Viper 26.1 at Camp Rodriguez, South Korea, Dec. 17, 2025. Korea Viper is a recurring exercise series that demonstrates the Republic of Korea and U.S. Marine Corps' ability to respond decisively in the region as a singular, unified force while strengthening relationships and trust between the two allies. Duran is a native of California, and Hilario is a native of Illinois. (U.S. Marine Corps photo by Cpl. John Simpson)