Pentagon

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Defense Secretary Ash Carter speaks at the Pentagon in this May 1, 2015, file photo. (AP Photo/Manuel Balce Ceneta)

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A new grenade being developed by the Pentagon will detect enemies hiding behind obstacles and explode. The Small Arms Grenade Munition (SAGM) is a 40mm, low-velocity round that the U.S. military is perfecting to give troops a higher probability of killing enemies “in defilade,” up to 500 meters away, and will be used with M203 or M320 rifle-mounted grenade launchers.

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Defense Secretary Ash Carter pauses while speaking at the Pentagon during a news conference, Friday, May 1, 2015, to discuss the Defense Department's annual report on sexual assault in the military. (AP Photo/Manuel Balce Ceneta)

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The Pentagon has dropped 60,000 leaflets over the Syrian town of Ar-Raqqa in an effort to dissuade residents from joining the Islamic State terror group. (Twitter/@JakeTapper)

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Incoming Defense Secretary Ash Carter, and his wife Stephanie Carter, during their arrival at the Pentagon in Washington, Tuesday, Feb. 17, 2015. Carter, who previously served as the No. 2 Pentagon official, replaced Chuck Hagel as the new Pentagon chief. (AP Photo/Pablo Martinez Monsivais)

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Incoming Defense Secretary Ash Carter, and his wife Stephanie Carter, during their arrival at the Pentagon in Washington, Tuesday, Feb. 17, 2015. Carter, who previously served as the No. 2 Pentagon official, replaced Chuck Hagel as the new Pentagon chief. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama speaks during the 9/11 memorial ceremony at the National 9/11 Pentagon Memorial at the Pentagon in Arlington, Va., Sept. 11, 2014. Pentagon photo.

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National Edition News cover for February 5, 2015 - Carter breaks with Obama over Ukraine, Guantanamo: Ashton Carter, President Barack Obama’s choice to be defense secretary, testifies on Capitol Hill in Washington, Wednesday, Feb. 4, 2015, before the Senate Armed Services Committee hearing on his nomination to replace Chuck Hagel as Pentagon chief. Carter, who previously served as the No. 2 Pentagon official, is expected to easily win Senate confirmation but will face tough questions about Iraq and other issues. (AP Photo/J. Scott Applewhite)

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Senate Armed Services Committee member Sen. Ted Cruz, R-Texas, left, joined by Sen. Mike Lee, R-Utah, center, poses questions to Ashton Carter, President Barack Obama's choice to be defense secretary, as he goes before the committee for confirmation to replace Chuck Hagel as Pentagon chief, Wednesday, Feb. 4, 2015, on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite) ** FILE **

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Ashton Carter, President Barack Obama's choice to be defense secretary, testifies on Capitol Hill in Washington, Wednesday, Feb. 4, 2015, before the Senate Armed Services Committee hearing on his nomination to replace Chuck Hagel as Pentagon chief. (AP Photo/J. Scott Applewhite) ** FILE **

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Middle man: Seif Gadhafi was communicating with the Pentagon through one of his friends, a U.S. businessman.

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Air Force Secretary Deborah Lee James speaks to the Associated Press during an interview at the Pentagon on July 11, 2014. (Associated Press) **FILE**

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Defense Secretary Chuck Hagel speaks at the Pentagon in this Dec. 4, 2014, file photo. (AP Photo/Cliff Owen, File)

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Critics say the Pentagon is spending too much taxpayer money on bombastic displays like sending aircraft to fly over stadiums, such as at last week's college football Military Bowl between Virginia Tech and Cincinnati in Annapolis. (Associated Press)

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After critics decried Ferguson, Missouri, police using Defense Department-donated heavy artillery against rioting protesters, some law enforcement agencies are returning military-grade weaponry back to the Pentagon. (Associated Press)

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Defense Secretary Chuck Hagel speaks during a news conference at the Pentagon, Friday, Nov. 14, 2014, where he announced that he is ordering top-to-bottom changes in how the nation's nuclear arsenal is managed, vowing to invest billions of dollars more to fix what ails a force beset by leadership lapses, security flaws and sagging morale. (AP Photo/Evan Vucci)

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After Defense Secretary Chuck Hagel abruptly resigned this week, Vice President Joseph R. Biden let it be known that he was "ticked off" about the way President Obama treated the third Pentagon chief to depart during his term — after less than two years. (Associated Press)