Marines in an Assaultman Course with Infantry Training Battalion, School of Infantry East, measure C-4 while constructing a diamond charge at ETA-7 demolition training range on Marine Corps Base Camp Lejeune, , Jan. 11, 2018. This exercise was held to demonstrate different demolition and explosive breaching training techniques, and to develop proficiency in mobility support to infantry units. ( Marine Corps photo by Lance Cpl. Ursula V. Smith)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: build, charges, commstrat, construct, corps, explosives, group, instruct, marine, mcieast, measure, soi-east, usmc