| skos:altLabel | - 503rd
- 1st Battalion, 503rd Infantry Regiment
- 2nd Battalion, 503rd Infantry Regiment
- 1/503 US Infantry's
- 1/503rd Infantry
- 1st Battalion, 503rd Infantry
- 1–503rd Infantry
- 2nd Battalion, 503rd Infantry
- 3rd Battalion, 503rd Infantry
- 4/503rd
- 4th Battalion, 503rd Infantry Regiment
- 503 Infantry
- 503 Parachute Infantry Regiment
- 503d
- 503d Infantry
- 503d Infantry Regiment
- 503d PIR
- 503rd Airborne
- 503rd Airborne Infantry
- 503rd Airborne Infantry Regiment
- 503rd Airborne Regiment
- 503rd Infantry
- 503rd Infantry Coat of Arms
- 503rd Infantry Distinctive Unit Insignia
- 503rd Infantry Regiment
- 503rd Infantry Regiment (Airborne)
- 503rd Infantry(Airborne)
- 503rd Parachute Infantry
- 503rd Parachute Infantry Battalion
- 503rd Parachute Infantry Regiment
- 503rd Parachute Infantry Regiment (PIR)
- 503rd Parachute Regiment
- 503rd Parachute Regimental Combat Team
- 503rd Regimental Combat Team
- 503rd parachute infantry regiment
- U.S. 503rd Parachute Infantry Regiment
- US 503rd Parachute Infantry Regiment
- US 503rd Parachute Regiment
- US 503rd Parachute Regiment
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