30-year-old Staff Sgt. Thomas Fogarty was commander of a mine-resistant ambush-protected vehicle when the attack happened in the city of Ahmad-Kheyl.
Three other soldiers were wounded by the IED. All four soldiers were assigned to the 3rd Battalion (Airborne), 509th Infantry Regiment, 4th Brigade Combat Team, 25th Infantry Division.
Fogarty was from Alameda, California and his next of kin have been notified.
He joined the Army in 2004 and arrived at JBER in January.
The soldiers deployed to Afghanistan in April as a replacement for the 4th Brigade Combat Team in support of Operation Enduring Freedom.