skos:altLabel | - 21st
- 21st Infantry Battalion
- 23rd Infantry Regiment
- 21st Infantry Regiment
- 21st U.S. Infantry
- 21st Infantry
- 21st Infantry Brigade
- 21st Regiment
- 1st Battalion, 21st Infantry
- 2-21 IN
- 21st Regimental Combat Team
- 21st United States Infantry Regiment
- 21st infantry
- 3rd Battalion, 21st Infantry
- 3rd Battalion, 21st Infantry Regiment
- 3rd Battle Group, 21st Infantry
- 4th Battalion, 21st Infantry
- 4th Battalion, 21st Infantry Regiment
- 5th Battalion, 21st Infantry
- 5th Battalion, 21st Infantry Regiment
- US Army, 21st Infantry
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