2nd Battalion, 23d Marine Regiment

A U.S. Marine with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, conducts a live fire range during a patrol during Korea Viper 25.4 at Camp Rodriguez, South Korea, May 22, 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. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marines with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, fire an M252 81 mm mortar during Korea Viper 25.4 at Camp Rodriguez, South Korea, May 23, 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. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marines with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, employ an M252 81 mm mortar during Korea Viper 25.4 at Camp Rodriguez, South Korea, May 23, 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. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marine Corps Lance Cpl. Fernando Valenzuela, left, and Cpl. Tristan Saghin, both infantry rifleman with 2nd Battalion, 23rd Marines forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, conduct room clearings as a part of military operations in urban terrain training during Korea Viper 25.4 at Pohang, South Korea, May 10, 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. Valenzuela is a native of Nevada. Saghin is a native of Nevada. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Navy Hospital Corpman 2nd Class Carson Richards with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, conducts military operations in urban terrain training during Korea Viper 25.4 at Pohang, South Korea, May 10, 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. Richards is a native of Tennessee. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marine Corps Lance Cpl. Angel Zaldivar, a motorman with 2nd Battalion, 23rd Marines forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, conducts room clearings as a part of military operations in urban terrain training during Korea Viper 25.4 at Pohang, South Korea, May 10, 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. Zaldivar is a native of Nevada. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marines with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, conduct military operations in urban terrain training during Korea Viper 25.4 at Pohang, South Korea, May 4, 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. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marines with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, clear buildings as a part of military operations in urban terrain training during Korea Viper 25.4 at Pohang, South Korea, May 3, 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. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marine Corps Staff Sgt. Ezequiel Delatorre, a network chief, with Headquarters and Service Company, 2nd Battalion, 23rd Marines, 4th Marine Division, Marine Forces Reserve, and a native of Oxnard California, counts Marines as they walk into a bus on Marine Air Ground Combat Center Twentynine Palms, California, March 11, 2025.The Marines are headed to Kadena Air Base, Okinawa, Japan as part of Unit Deployment Program 25.1. The activation marks the beginning of an intensive period of training for 2nd Battalion, 23rd Marines as they provide a total force solution in support of the UDP by aligning Marine Forces Reserve’s commitment to Marine Corps strategic objectives. This is first time since 2020 that an entire Reserve infantry battalion has activated to support the Unit Deployment Program. (U.S. Marine Corps photo by Sgt. Scott Jenkins)

U.S. Navy Hospital Corpsman Petty Officer 1st Class Billy Bui, a senior line corpsman with Weapons Company, 2nd Battalion, 23rd Marine Regiment, 4th Marine Division, poses for a photo during an Adversarial Force Exercise at Marine Corps Air Ground Combat Center, Twentynine Palms, California, Dec. 9, 2024. Marines with 2nd Battalion, 23rd Marine Regiment participated in AFX, the primary readiness generating event, prior to their deployment as an opportunity to receive training across all warfighting functions in a realistic and fully resourced environment. This deployment is significant for the Reserve battalion and Reserve force contributing units to support exercises and operations outside of the continental U.S. (U.S. Marine Corps photo by Cpl. Madisyn Paschal)

U.S. Marines observe the point of impact for 81 mm mortars during an adversarial force exercise at Marine Corps Air Ground Combat Center, Twentynine Palms, California, Dec. 3, 2024. The AFX is the primary readiness-building event prior to the 2nd Battalion, 23rd Marine Regiment, 4th Marine Division’s upcoming deployment to Okinawa, Japan. The unit will spend the coming months focusing on different military operations in an urban terrain to prepare for its deployment into the first island chain, ensuring the Marines are fully manned, trained and equipped to meet mission challenges. (U.S. Marine Corps photo by Cpl. Madisyn Paschal)

U.S. Marines execute motorized fire and movement training during an adversarial force exercise on Noble’s Pass at Marine Corps Air-Ground Combat Center, Twentynine Palms, California, Dec. 4, 2024. Marines with Weapons Company and Motor Transport Company, 2nd Battalion, 23rd Marine Regiment, 4th Marine Division, conducted this range to increase accuracy and efficiency in motorized fire in preparation for their upcoming deployment to Okinawa, Japan, in support of the Marine Corps’ Unit Deployment Program. The exercise serves as an opportunity to receive training across all warfighting functions in a realistic and fully resourced environment. (U.S. Marine Corps photo by Lance Cpl. Orion Stpierre)