421st may refer to:
- 421st Air Refueling Squadron, inactive United States Air Force unit
- 421st Assault Aviation Regiment, original name of the Yugoslav 107th Mixed Aviation Regiment
- 421st Bombardment Squadron, inactive United States Air Force unit
- 421st Fighter Squadron (421 FS), part of the 388th Fighter Wing at Hill Air Force Base, Utah
See also
- 421 (number)
- 421, the year 421 (CDXXI) of the Julian calendar
- 421 BC
Topics referred to by the same termThis disambiguation page lists articles about military units and formations which are associated with the same title. If an internal link referred you to this page, you may wish to change the link to point directly to the intended article.
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