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U.S. Marine Corps Sgt. Estevan Diaz, a mortarman with 1st Battalion, 6th Marines, forward deployed with 4th Marine Regiment, 3rd Marine Division as part of the Unit Deployment Program, checks his radio while conducting platoon attacks in an urban environment during Korea Viper 26.1 at Camp Rodriguez, South Korea, Dec. 17, 2025.

Radio Check

U.S. Marine Corps photo by Cpl. John Simpson/Released 251217-M-SH338-1248.JPG

Jan 13, 2026

U.S. Marine Corps Sgt. Estevan Diaz, a mortarman with 1st Battalion, 6th Marines, forward deployed with 4th Marine Regiment, 3rd Marine Division as part of the Unit Deployment Program, checks his radio while conducting platoon attacks in an urban environment during Korea Viper 26.1 at Camp Rodriguez, South Korea, Dec. 17, 2025.

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CAMERA

Canon EOS R5

LENS

RF28-70mm F2 L USM

APERTURE

71/10

SHUTTERSPEED

1/160

ISO

100

IMAGE IS PUBLIC DOMAIN

This photograph is considered public domain and has been cleared for release. If you would like to republish please give the photographer appropriate credit. Further, any commercial or non-commercial use of this photograph or any other DoD image must be made in compliance with guidance found at https://www.dimoc.mil/resources/limitations, which pertains to intellectual property restrictions (e.g., copyright and trademark, including the use of official emblems, insignia, names and slogans), warnings regarding use of images of identifiable personnel, appearance of endorsement, and related matters.