The U.S. Army Information Systems Engineering Command (USAISEC or ISEC) is a command of the United States Army under the Army Communications-Electronics Command (CECOM). ISEC is headquartered on Fort Huachuca, Arizona.
USAISEC was formed in 1943 as the Plant and Engineering Agency, and as part of the U.S. Army Signal Corps. The agency’s mission was engineering and installing airport communications for the air navigation and meteorological facilities under the Army Airways Communications System.[1]
In 1955 the Plant and Engineering Agency was re-designated as the Army Signal Engineering Agency.[1]
The Army Signal Engineering Agency and the Army Communications Agency were joined under the newly established Army Strategic Communications Command (STRATCOM) in 1962.[1] The Strategic Communications Command relocated from Washington, D.C. to Fort Huachuca, Arizona, in 1967.[1]
Shortly after relocating, the Army Signal Engineering Agency was re-designated as the U.S. Army Communications Engineering and Installation Agency (USACEIA).[1] (Later, the USACEIA was re-designated as the U.S. Army Communications-Electronics Engineering Installation Agency, known as USACEEIA)).[2]

On 1 October 1984, the Army established the U.S. Army Information Systems Command (ISC) to consolidate all information management-related responsibilities under a single command.[1]
Also on that date, the U.S. Army Computer Systems Command (USACSC), a then-field operating activity of the assistant deputy chief of staff for operations-C4 (command, control, communications and computers), was transferred to the ISC as a major subordinate command, and briefly designated as the U.S. Army Information Systems Software Support Command (ISSSC).[1][2]
Nine months later, the ISSSC was re-designated as the U.S. Army Information Systems Engineering Command (ISEC).[1][2]
ISEC's headquarters were relocated from Fort Belvoir, Virginia, to Fort Huachuca, Arizona, on 1 October 1987.[1]
1996年10月1日、陸軍の情報管理ユニットの構造に関する調査の結果、 ISECは米国陸軍通信電子コマンド(CECOM)に移管された。 [ 1 ]旧陸軍情報システムコマンド(ISC)の情報管理関連の取得、エンジニアリング、調達機能はすべてCECOMに割り当てられた。[ 3 ]

2025年、USAISECは陸軍の通信セキュリティ(COMSEC)近代化プログラム[ 4 ]において、陸軍施設の情報システムを更新し、より強靭で複雑性の低いものにするために機能した。[ 5 ]