Marines with Alpha Company, 4th Combat Engineer Battalion, 4th Marine Division, dismount their Assault Breacher Vehicles to attend a safety brief prior to an obstacle clearing detachment practical application, during Integrated Training Exercise 4-18, aboard Marine Corps Air Ground Combat Center Twentynine Palms, California, June 12, 2018. The OCD training was conducted to prepare Marines for the execution of a live-fire combined arms breach in which mechanized units will detonate a 1,000 pound mine clearing charge.

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