The U.S. Marines have a problem. The CH-53E Super Stallion medium-heavy lift helicopters they rely upon to move troops, vehicles, and supplies off of their ships are wearing out. Fast. Yet the pace demanded by the Global War on Terror is relentless. Attrition is taking its toll, and CH-53s are being recalled from "boneyard" storage at Davis-Monthan AFB in Tucson, AZ, in order to maintain fleet numbers in the face of recent losses and forced retirements. By 2012-2015, replacements will be urgently needed.

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http://www.defenseindustrydaily.com/2006/12/ch53k-the-us-marines-hlr-helicopter-program-updated/index.php