U.S. Army Command Sgt. Maj. Frank A. Grippe, left, command senior enlisted leader for U.S. Central Command, and Command Sgt. Maj. Edd Watson, 3rd Infantry Division and Regional Command South command sergeant major, enjoy some chow at the Carbon Rod Cafe after conducting a foot patrol in the Panjwai district of southern Afghanistan, Sept. 22, 2012. U.S. Army photo by Sgt. Matt Young

U.S. Army Command Sgt. Maj. Frank A. Grippe, command senior enlisted leader for U.S. Central Command, speaks with soldiers on a foot patrol in the Panjwai district of southern Afghanistan, Sept. 22, 2012. Grippe visited the soldiers as part of his visit to Regional Command South. The soldiers are assigned to the 2nd Infantry Division's Company A, 1st Battalion, 23rd Infantry Regiment. U.S. Army photo by Sgt. Matt Young

Deputy Defense Secretary Ashton B. Carter speaks with Marine Corps Staff Sgt. Michael Burkheart atop an amphibious assault vehicle on Marine Corps Base Camp Pendleton, Calif., Sept. 27, 2012. Carter and Navy Secretary Ray Maybus visited the USS Makin Island and units stationed on Camp Pendleton during their two-day visit to San Diego. DOD photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

Deputy Defense Secretary Ashton B. Carter visits with Marines assigned to the 3rd Assault Amphibian Battalion on Marine Corps Base Camp Pendleton, Calif., Sept. 27, 2012. Carter and Navy Secretary Ray Mabus visited the USS Makin Island and units on Camp Pendleton during their two-day visit to San Diego. DOD photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley

U.S. Defense Secretary Leon E. Panetta speaks with Canadian Defense Minister Peter G. MacKay at the Pentagon, Sept. 28, 2012. DOD photo by Glenn Fawcett

U.S. Defense Secretary Leon E. Panetta and Canadian Defense Minister Peter G. MacKay hold a joint press conference at the Pentagon, Sept. 28, 2012. DOD photo by Glenn Fawcett

U.S. Defense Secretary Leon E. Panetta, left, and Canadian Defense Minister Peter G. MacKay hold a joint press conference at the Pentagon, Sept. 28, 2012. DOD photo by Glenn Fawcett

U.S. Defense Secretary Leon E. Panetta hosts an honor cordon to welcome Canadian Defense Minister Peter G. MacKay to the Pentagon, Sept. 28, 2012. DOD photo by Glenn Fawcett