DOD Identifies Army Casualties The Department of Defense announced today the deaths of two soldiers who were supporting Operation Enduring Freedom. Staff Sgt. Thaddeus S. Montgomery, 29, of West Yellowstone, Mont., died Jan. 20 at Lorengal Outpost, Afghanistan. He was assigned to the 2nd Battalion, 12th Infantry Regiment, 4th Brigade Combat Team, 4th Infantry Division, Fort Carson, Colo. Capt. Paul Pena, 27, of San Marcos, Texas, died Jan. 19 in Arghandab River Valley, Afghanistan, of wounds suffered when enemy forces attacked his unit with an improvised explosive device. He was assigned to the 2nd Battalion, 508th Parachute Infantry Regiment, 4th Brigade Combat Team, 82nd Airborne Division, Fort Bragg, N.C.