504th

504th may refer to:

504th Battlefield Surveillance Brigade (BfSB), located at Fort Hood, Texas 504th Bombardment Group (504th BG), a World War II United States Army Air Forces combat organization 504th Expeditionary Air Support Operations Group, active United States Air Force unit 504th Fighter Squadron or 137th Airlift Squadron flies the C-5 Galaxy and the C-17A Globemaster III 504th Infantry Regiment (United States), an airborne forces regiment of the US Army

See also 504 (number) 504, the year 504 (DIV) of the Julian calendar 504 BC