Keywords: Pentagon's Energy Security Event 121004-D-NI589-324.jpg en Secretary of Defense Leon E Panetta left listens as Dean McGrew with the U S Army Tank Automotive Research Development and Engineering Center describes the features of a diesel-electric hybrid troop vehicle prototype on display in the Pentagon courtyard during the Pentagon's Energy Security Event Oct 4 2012 2012-10-04 DoD photo by Glenn Fawcett https //www dvidshub net/image/677744 121004-D-NI589-324 2012-10-07 19 18 ARLINGTON VA US PD-USGov Leon Panetta Images from DoD uploaded by Fæ Photographs by Glenn Fawcett |