United States Department Of Defense

Department of Defense.jpg

A B-2 Spirit multi-role bomber conducts air refueling operations with a KC-135 Stratotanker over the Pacific on April 4, 2005. (Image: Department of Defense)

c55acf3cc1446611530f6a706700e7c9.jpg

FILE - In this May 21, 2011 file photo provided by the Department of Defense, Maj. George Kraehe, of Albequerque, N.M., center, and other runners pass the Fargo Theater during a marathon in Fargo, N.D. The Fargo Marathon, being run Saturday, May, 10, 2014, is celebrating its 10th anniversary this year with more than 23,000 participants. (AP Photo/Department of Defense, Senior Master Sgt. David H. Lipp, File)

6eb0f9130dcaf211520f6a7067000e0d.jpg

Defense Secretary Chuck Hagel introduces Sexual Assault Prevention and Response Office Director, Maj. Gen. Jeffrey Snow, during a news conferene about the Defense Department's sexual assault prevention and response program, Thursday, May 1, 2014, at the Pentagon. (AP Photo/Manuel Balce Ceneta)

3a5ded91db2dcf0a4e0f6a706700c909.jpg

FILE - This Sept. 17, 2013 file photo shows an armed officer who said he is with the Defense Department, standing near guard the gate at the Washington Navy Yard the day after a gunman launched an attack inside the Yard. An independent review triggered by the Washington Navy Yard killings last year says threats to Defense Department personnel and facilities increasingly are coming from within. It says the department must rethink its outdated security theory that suggests defending the perimeters can keep threats away. Instead, it says that terrorism, espionage and even physical threats are coming from trusted insiders. (AP Photo/Jacquelyn Martin, File)

20140318-national-news-cover.jpg

National Edition News cover for March 18, 2014 - SENSOR OF THE PAST, FLIER OF THE FUTURE: HIGH HOPES: The Defense Department will try to convince Congress that transferring the sensor from its old, reliable U-2 spy plane (top) to the Global Hawk surveillance drone would be more cost-efficient than keeping both in the air.