4/22/2011 - From left, Timothy Bridges, the Deputy Assistant Secretary of the Air Force for Environmental Safety and Occupational Health; Col. Ken Rizer, the 11th Wing/Joint Base Andrews commander; Erin Conaton, the Under Secretary of the Air Force; Rep. Donna F. Edwards, of the Maryland 4th Congressional District; and Col. Phillip Gibbons, the Air Force District of Washington vice commander, shovel soil to plant a red maple sapling during the Earth Day observance kickoff April 20, 2011at Joint Base Andrews, Md. 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)

4/22/2011 - Susan Bench-Snow, the Secretary of the Air Force Administrative Assistant Facilities director, shows Under Secretary of the Air Force Erin Conaton and Timothy Bridges, the Deputy Assistant Secretary of the Air Force for Environmental Safety and Occupational Health, the new William A. Jones III Building at Joint Base Andrews, Md., following an Earth Day and Arbor Day tree planting ceremony, April 20, 2011. (U.S. Air Force photo/Senior Airman Melissa V. Brownstein)

4/22/2011 - Susan Bench-Snow, the Secretary of the Air Force Administrative Assistant Facilities director, shows Under Secretary of the Air Force Erin Conaton the “green” roof of the William A. Jones III Building following an Earth Day and Arbor Day tree planting ceremony April 20, 2011, at Joint Base Andrews, Md. The roof of the Jones Building is lined with low maintenance flora, which will not exceed more than eight inches in height and keeps the building cooler in the warmer months while using less energy. (U.S. Air Force photo/ Senior Airman Melissa V. Brownstein)

4/22/2011 - (From left) Susan Bench-Snow, Secretary of the Air Force Administrative Assistant Facilities director, Erin Conaton, Under Secretary of the Air Force, and Col. Phillip Gibbons, Air Force District Washington vice commander, tour the green roof of the new William A. Jones III Building, following an Earth Day and Arbor Day tree planting ceremony at Joint Base Andrews, Md., April 20, 2011. The new Jones building is constructed of more than 20 percent recycled material and features storm water recycling systems and green roofing which will help make the infrastructure energy efficient. These features will save the Air Force 44.7 percent annually on energy costs compared to the offices the new building replaces. (U.S. Air Force photo/ Senior Airman Melissa V. Brownstein)

4/22/2011 - Susan Bench-Snow, the Secretary of the Air Force Administrative Assistant Facilities director, shows (from right) Erin Conaton, the Under Secretary of the Air Force; Col. Phillip Gibbons, the Air Force District Washington vice commander; Col. Ken Rizer, the 11th Wing/Joint Base Andrews commander; and Timothy Bridges, the Deputy Assistant Secretary of the Air Force for Environmental Safety and Occupational Health, a break area inside the new William A. Jones III Building following an Earth Day and Arbor Day tree planting ceremony April 20, 2011, at Joint Base Andrews, Md. (U.S. Air Force photo/ Senior Airman Melissa V. Brownstein)

4/22/2011 - Susan Bench-Snow, the Secretary of the Air Force Administrative Assistant Facilities director, shows Under Secretary of the Air Force Erin Conaton the new appellate court room inside the William A. Jones III Building, following an Earth Day and Arbor Day tree planting ceremony April 20, 2011, at Joint Base Andrews, Md. The building features two court rooms, one for base legal services and the other for Air Force appeals. (U.S. Air Force photo/ Senior Airman Melissa V. Brownstein)

4/22/2011 - Col. Michael Welsh, the Air Force Legal Operations Agency vice commander, speaks to Under Secretary of the Air Force Erin Conaton and Col. Ken Rizer, the 11th Wing/Joint Base Andrews commander, at the completion of a tour of the new William A. Jones III Building, following an Earth Day and Arbor Day tree planting ceremony April 20, 2011, at Joint Base Andrews, Md. (U.S. Air Force photo/ Senior Airman Melissa V. Brownstein)