The full form of "army" is not explicitly mentioned in the search results. However, the term "army" refers to a large organized body of armed personnel trained for war, especially on land
. In the context of the United States Army, it is composed of an active duty component and a reserve component that comprises the Army Reserve and Army National Guard
. The Army is headed by a civilian senior appointed civil servant, the Secretary of the Army, and by a chief military officer, the Chief of Staff of the Army
