SECRETARIES' SIGNING Defense Secretary Leon E. Panetta, left, and Interior Secretary Kenneth Lee Salazar sign an agreement at the Pentagon, July 20, 2012, in which 13 million acres of Defense Department land will be made available for wind, solar and geothermal energy projects. Salazar announced the agreement in Washington, D.C., Aug. 6, 2012, on the eve of National Clean Energy Summit. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 478653-V-LYB15-703.jpg Photo Gallery