They are based on Camp Schwab, Okinawa, Japan and their mission includes construction, demolition, supply, transportation, maintenance and fabrication.

Provide direct support (DS) tactical logistics to a 4th Marine Regiment beyond its organic capabilities in the areas of transportation, intermediate level supply, field level maintenance, and general engineering.

CLB-4 was the first full battalion to deploy from Okinawa, Japan since the Vietnam War.

The battalion deployed to Al Anbar Province, Iraq in support of Regimental Combat 6 during Operation Iraqi Freedom in 2007 and 2009.

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