From left to right, Lt. Gen. David Halverson, the Army assistant chief of staff for installation management; Katherine Hammock, the assistant secretary of the Army for installations, energy and environment; Miranda Ballentine, the assistant secretary of the Air Force for installations, environment and energy; and Lt. Gen. John Cooper, the Air Force deputy chief of staff for logistics, engineering and force protection, pose for a photo after signing a memorandum of agreement that formalizes the partnership between the service energy offices at the Pentagon, Washington, D.C., April 6, 2016. (U.S. Air Force photo/Antoinette Smith)

PHOTO BY: Antoinette Smith
VIRIN: 160406-F-HW140-428.JPG
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