The 1st Brigade Special Troops Battalion, 1st Armored Brigade Combat Team, 2nd Infantry Division was activated as a part of the 1st Heavy Brigade Combat Team (later Armored Brigade), 2nd Infantry division on 20 June 2005, with the 2nd Engineer Battalion being reflagged under the 1st BSTB designation (the 2nd had been inactivated five days earlier).
Nicknamed the “Spartans,” the 1st BSTB comprised a Headquarters Company; Reconnaissance and Security components; Chemical, Military Intelligence, and Signal companies; and a Military Police platoon.
On 2 July 2015, the 1st Armored Brigade Combat Team, with the official special designation “Iron Brigade," cased its colors as it was inactivated in a ceremony held at Camp Casey in Seoul, South Korea. In addition to the brigade, several other units were also inactivated, including the 1st Brigade Special Troops Battalion. It was the last Special Troops Battalion to inactivate as part of the Army’s transition to Brigade Engineer Battalions.du