Vandenberg celebrates Earth Day
VANDENBERG AIR FORCE BASE, Calif. -- Pressure flaking a stone, Bob Peterson, a 30th Civil Engineer Squadron archeologist, carves out a tool with a copper pressure flaker during Vandenberg's 10th Annual Earth Day event in front of the base library here Wednesday, April 29, 2010. Pressure flaking is a technique used to carve stones into hand-made weapons and tools. (U.S. Air Force photo/Senior Airman Andrew Satran)
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