12th Annual Earth Day event
VANDENBERG AIR FORCE BASE, Calif. --Bob Peterson, a 30th Civil Engineer Squadron archaeologist, shows Jackson and Heather Smith, Air Force dependents, how he digs for artifacts on base during an Earth Day event here Wednesday, April 18, 2012. More than 25 base and local organizations participated in this environmental awareness campaign. (U.S. Air Force photo/Staff Sgt. Andrew Satran)