1st IO Command (Land) is the Army's only active duty IO unit. It is a multi-component unit with an integrated U.S. Army Reserve Element. The command consists of a Brigade Headquarters and two subordinate IO battalions, each with both active duty and Army Reserve detachments.
Stationed at Ft. Belvoir, Virginia, 1st IO Command is assigned to U.S. Army Cyber. The Command's Army Reserve Element falls under the administrative control of the 335th Signal Command.