Defense Secretary Chuck Hagel, right, meets with retired Air Force Gen. Larry D. Welch, left, and retired Navy Adm. John C. Harvey Jr., second from left, at the Pentagon, Feb. 19, 2014. Welch and Harvey will begin an independent review of the Defense Department's nuclear enterprise to correspond with an internal review, responding to revelations of irregularities within the nuclear enterprise. Army Lt. Gen. Robert B. Abrams, the secretary's senior military assistant, second from right, attends the meeting. Note: This image has been altered for operational security purposes.