From Citizendium, the Citizens' Compendium
- Military doctrine : The fundamental principles of a military organization.
- Echelons above corps : Military resources under the control of a headquarters above the level of the highest tactical organization (i.e., a corps), usually a theater or national level of command; the higher headquarters may delegate tactical control of them to subordinate units, or control them directly (e.g., reconnaissance satellites, elite special operations forces)
- First United States Army : Headquarters organization of the reserve components of the United States Army
- Third United States Army : In United States Central Command, the headquarters organization for United States Army Components. Also designated ARCENT.
- : Former name for United States Army North
- Seventh United States Army : Headquarters for the U.S. Army elements of United States European Command; the largest formation in the United States Army. Also designated USAREUR. Major U.S. Army formation in the WWII Battle of Sicily (Operation HUSKY)
- Eighth United States Army : Actually consisting of a reinforced division, this is the headquarters for U.S. Army forces in South Korea, but its four-star commander also commands United States Forces Korea and the United Nations Command
- : Headquarters for U.S. Army units assigned to Homeland Defense missions in the United States