A U.S. soldier killed by a improvised explosive device in Afghanistan has been identified as Spc. William Gilbert, 24, of Hacienda Heights, according to the Department of Defense.

Three other soldiers were also killed in the blast, Sgt. 1st Class Jeffrey Baker, 29, of Hesperia, Spc. Mitchell Daehling, 24, of Mass., and one who is yet to be identified, Major Joe Buccino said.

Gilbert enlisted in August 2010 and was on his first combat tour. He was assigned to the 3rd Battalion, 41st Infantry Regiment, 1st Brigade Combat Team, 1st Armored Division, from Fort Bliss, Texas. He was deployed in Afghanistan for Operation Enduring Freedom.

Read more in GILBERT.