JOINT BASE ANDREWS, Md. – From left, Timothy Bridges, Deputy Assistant Secretary of the Air Force for Environmental Safety and Occupational Health; Col. Ken Rizer, 11th Wing/Joint Base Andrews commander; Erin Conaton, Under Secretary of the Air Force; Rep. Donna F. Edwards, Maryland 4th Congressional District; and Col. Phillip Gibbons, Air Force District of Washington vice commander, shovel soil to plant a red maple sapling during the Earth Day observance kickoff here April 20, 2011. During the ceremony, Ms. Conaton addressed attendees and emphasized the Air Force’s commitment to good stewardship of the natural resources the service depends upon today to ensure a secure tomorrow. (U.S. Air Force Photo/Bobby Jones)