Marines with 3rd Battalion, 4th Marine Regiment, 1st Marine Division (MARDIV), execute a breach using a M1 Assault Breacher Vehicle during exercise Steel Knight (SK) 18 at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 10, 2017. SK-18 is a division level exercise designed to enhance the command and control and interoperability with the 1st MARDIV, its adjacent units and naval support forces. ( Marine Corps

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