863rd Engineer Battalion

The 863rd Engineer Battalion is an engineer battalion of the United States Army first formed in 1942. The 863rd participated in World War II.

Organization

The battalion is a subordinate unit of the 372nd Engineer Brigade. As of January 2026 the battalion consists of the following units:863rd Engineer Battalion, in Darien

Constituted 15 July 1942 in the Army of the United States as the 1st Battalion, 922nd Engineer Regiment, Aviation
Activated 1 August 1942 at Geiger Field, Washington, as the 1st Battalion, 922nd Engineer Aviation Regiment
Redesignated 1 February 1942 as the 863rd Engineer Aviation Battalion
Inactivated 15 June 1946 in the Philippine Islands
Allotted 18 February 1949 to the Organized Reserve Corps
Activated 24 March 1949 with headquarters at Chicago, Illinois
Inactivated 17 January 1955 at Chicago, Illinois
Redesignated 18 August 1959 as the 863rd Engineer Battalion
Activated 1 October 1959 with headquarters at Aurora, Illinois

;World War II

;Operation Enduring Freedom
;Operation Inherent Resolve

Philippine Presidential Unit Citation, Streamer embroidered 17 October 1944 to 4 July 1945
Valorous Unit Award, Medal awarded to 863rd Engineer Battalion for its performance in support of Task Force Strike, 2nd BCT, 101st Airborne Division throughout RC-South, Afghanistan, Operation Enduring Freedom; from 20 June 2010 to 15 April 2011.

;Operation Enduring Freedom

Controversy briefly erupted shortly after ending operations in Afghanistan when the 863rd Engineer Battalion was accused of abandoning one of its attached subordinate units to adverse weather conditions during the demobilization process in order to allow its organic personnel not to be inconvenienced by Hurricane Irene.