USMC D7 bulldozer raising an earth bern to protect artillery gun.

Caption: A 12th Marine Regiment engineers bulldozer reinforces the berm around a gun emplacement at the Central Training Area during a training exercise April 3. The exercise was an opportunity for heavy eqipment operators and utilities Marines to perform each other's jobs. Photo by: Sgt. Scott Carlson

http://www.usmc.mil/marinelink/image1.nsf/Lookup/20025632514

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