United States Department Of Defense

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An officer who said he was with the Department of Defense (right) and Navy personnel stand guard inside the gate of the closed Washington Navy Yard on Tuesday. (ASSOCIATED PRESS)

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A dozen senators — Republicans and Democrats, led by Sen. John Cornyn, Texas Republican — are not happy about the Defense Department buying 30 helicopters destined for Afghanistan that it bought from a Russian manufacturer.

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A U.S. Marine during combat training exercises. (credit: Department of Defense)

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Virginia Gov. Bob McDonnell is part of a delegation that traveled to Kuwait and Afghanistan this week to visit troops (Photo courtesy of the Department of Defense)

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A Department of Defense presentation on religious extremism. (Department of Defense)

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**FILE** Pentagon Comptroller Robert F. Hale listens as Secretary of Defense Robert Gates and Chairman of the Joint Chiefs of Staff Adm. Michael Mullen testify regarding the Department of Defense fiscal 2012 budget request before the Senate Appropriations Committee Subcommittee on Defense on Capitol Hill in Washington on June 15, 2011. (Associated Press)

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Secretary of Defense Leon E. Panetta (left) and Chairman of the Joint Chiefs of Staff General Martin E. Dempsey (right) testify Feb. 7, 2013, on Capitol Hill before the United States Committee on Armed Services to answer questions on the Department of Defense response to the attack on U.S. facilities in Benghazi, Libya. (Andrew Harnik/The Washington Times)

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Secretary of Defense Leon E. Panetta testifies before the Senate Armed Services Committee on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on the Defense Department's response to the attack on U.S. facilities in Benghazi, Libya. (Andrew Harnik/The Washington Times)

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** FILE ** Sen. Mark Udall (left), Colorado Democrat, talks with Secretary of Defense Leon E. Panetta before Mr. Panetta testifies before the Senate Armed Services Committee on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on the Defense Department's response to the attack on U.S. facilities in Benghazi, Libya. (Andrew Harnik/The Washington Times)

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Secretary of Defense Leon E. Panetta (left) and Army Gen. Martin E. Dempsey (right), chairman of the Joint Chiefs of Staff, arrive to testify before the Senate Armed Services Committee on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on the Defense Department's response to the attack on U.S. facilities in Benghazi, Libya. (Andrew Harnik/The Washington Times)

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Secretary of Defense Leon E. Panetta (center) and Army Gen. Martin E. Dempsey (right), chairman of the Joint Chiefs of Staff, arrive to testify before the Senate Armed Services Committee on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on the Defense Department's response to the attack on U.S. facilities in Benghazi, Libya. (Andrew Harnik/The Washington Times)

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Secretary of Defense Leon E. Panetta (left) and Army Gen. Martin E. Dempsey (right), chairman of the Joint Chiefs of Staff, testify before the Senate Armed Services Committee on Capitol Hill in Washington on Thursday, Feb. 7, 2013, on the Defense Department's response to the attack on U.S. facilities in Benghazi, Libya. (Andrew Harnik/The Washington Times)