First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Division, 1st Senate district, 1st Fighter Brigade, Royal 1st Devon Yeomanry, 3rd Battalion, 1st Marines, 1st Rifle Division, 1st Armoured Infantry Brigade (United Kingdom), 1st Word, 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Theater Sustainment Command, 1st Squadron, 1st Cavalry Regiment, 1st Hussars, 1st Reconnaissance Squadron, 1st Marine Expeditionary Brigade (United States), 1st Armored Division (United States), 2nd Battalion, 1st Marines, 1st Brigade, 1st Brigade Combat Team, 1st Infantry Division (United States), 1st & Ten, 1st Marine Regiment (United States), 1st Marine Division, 1st Arkansas Infantry Regiment, 1st Michigan Infantry Regiment, 1st Maryland Cavalry Battalion, 1st Brigade Combat Team, 1st Distribution Support Battalion, 1945–46 Danish 1st Division, 1951–52 Danish 1st Division, 1st Artillery Regiment, 1st Airborne, 1st Bombardment Wing, 1st Engineer Regiment (Italy), 1st Arkansas Cavalry Regiment

1955–56 Danish 1st Division, 1946–47 Danish 1st Division, 1947–48 Danish 1st Division, 1st Kentucky Infantry Regiment, 1949–50 Danish 1st Division, 1948–49 Danish 1st Division, 1952–53 Danish 1st Division, 1954–55 Danish 1st Division, 1950–51 Danish 1st Division, 1st Air Defense Artillery Regiment, 1st Kentucky Cavalry Regiment, 1st Constitution Bancorp, 1953–54 Danish 1st Division, 1st Missouri Infantry Regiment, 1st Brigade (Australia), 1st Louisiana Infantry Regiment, 1st Division (Thailand), 1st (UK) Division, 1st Airborne Command Control Squadron, 1st Armoured Brigade (United Kingdom), 1st Maryland Infantry Regiment, 1st Belorussian Front, 1st Delaware Infantry Regiment, 1st Horse (Skinner's Horse), 1st (African) Division, 1st ward, Chicago, 1st Battle Squadron, 1st Division (Australia), 1st Louisiana Cavalry Regiment, 1st Armored, 1st Cavalry Division (United States), 1st Medical Brigade, 1st Combat Engineer Battalion, 1st Brahmans, 1st Expeditionary Rescue Group, 1st Infantry Division (United States), 1st Colorado Infantry Regiment, 1st Parachute Division (Germany), 1st Georgia Infantry Regiment, 1st Infantry Regiment (United States), 1st Canadian Parliament, Ōita 1st district, 1st Fighter Wing, 1st Fighter Squadron, 1st Infantry Division (France), Francis Cook, 1st Viscount of Monserrate, 1st Light Car Patrol (Australia), 1st Anti-Aircraft Brigade, 1st Pontieri Regiment, 1st Armored Division (France)

First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Division, 1st Senate district, 1st Fighter Brigade, Royal 1st Devon Yeomanry, 3rd Battalion, 1st Marines, 1st Rifle Division, 1st Armoured Infantry Brigade (United Kingdom), 1st Word, 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Theater Sustainment Command, 1st Squadron, 1st Cavalry Regiment, 1st Hussars, 1st Reconnaissance Squadron, 1st Marine Expeditionary Brigade (United States), 1st Armored Division (United States), 2nd Battalion, 1st Marines, 1st Brigade, 1st Brigade Combat Team, 1st Infantry Division (United States), 1st & Ten, 1st Marine Regiment (United States), 1st Marine Division, 1st Arkansas Infantry Regiment, 1st Michigan Infantry Regiment, 1st Maryland Cavalry Battalion, 1st Brigade Combat Team, 1st Distribution Support Battalion, 1945–46 Danish 1st Division, 1951–52 Danish 1st Division, 1st Artillery Regiment, 1st Airborne, 1st Bombardment Wing, 1st Engineer Regiment (Italy), 1st Arkansas Cavalry Regiment, 1955–56 Danish 1st Division, 1946–47 Danish 1st Division, 1947–48 Danish 1st Division, 1st Kentucky Infantry Regiment, 1949–50 Danish 1st Division, 1948–49 Danish 1st Division, 1952–53 Danish 1st Division, 1954–55 Danish 1st Division, 1950–51 Danish 1st Division, 1st Air Defense Artillery Regiment, 1st Kentucky Cavalry Regiment, 1st Constitution Bancorp, 1953–54 Danish 1st Division, 1st Missouri Infantry Regiment, 1st Brigade (Australia), 1st Louisiana Infantry Regiment, 1st Division (Thailand), 1st (UK) Division, 1st Airborne Command Control Squadron, 1st Armoured Brigade (United Kingdom), 1st Maryland Infantry Regiment, 1st Belorussian Front, 1st Delaware Infantry Regiment, 1st Horse (Skinner's Horse), 1st (African) Division, 1st ward, Chicago, 1st Battle Squadron, 1st Division (Australia), 1st Louisiana Cavalry Regiment, 1st Armored, 1st Cavalry Division (United States), 1st Medical Brigade, 1st Combat Engineer Battalion, 1st Brahmans, 1st Expeditionary Rescue Group, 1st Infantry Division (United States), 1st Colorado Infantry Regiment, 1st Parachute Division (Germany), 1st Georgia Infantry Regiment, 1st Infantry Regiment (United States), 1st Canadian Parliament, Ōita 1st district, 1st Fighter Wing, 1st Fighter Squadron, 1st Infantry Division (France), Francis Cook, 1st Viscount of Monserrate, 1st Light Car Patrol (Australia), 1st Anti-Aircraft Brigade, 1st Pontieri Regiment, 1st Armored Division (France), 1st Royal New South Wales Lancers, 1st (Peshawar) Division, 1956–57 Danish 1st Division, 1st Source, 1st Special Operations Squadron, 1st Foreign Regiment (France), 1st Arkansas Consolidated Infantry Regiment, 1st Marine Logistics Group, 1st Low Altitude Air Defense Battalion, 1st Cavalry Regiment (United States), 1st Provisional Marine Brigade, 1st Test and Evaluation Squadron, 1st Air Cavalry Brigade, 1st Civil Affairs Group, Joseph Maclay, 1st Baron Maclay, 1st Earl of Suffolk, 1st Mobile Corps, 1st Battalion, 5th Marines, 1959 Danish 1st Division, 1st Marine Aircraft Wing, 1st Aviation Regiment (United States), 1st Health Battalion (Australia), 1st Canadian Division, 1st Airlanding Brigade (United Kingdom), 1st Armoured Division (Australia), 1960 Danish 1st Division, 1st Earl Temple, 1st Ski Division (Wehrmacht), 1st Guards Brigade (Croatia), Komandarm 1st rank, 2002–03 Danish 1st Division, 2003–04 Danish 1st Division, 1st Minnesota Infantry Regiment, Captain 1st rank, 1st Time, 1958 Danish 1st Division, 2000–01 Danish 1st Division, 1st Strategic Aerospace Division, 1st Commonwealth Division, 1997–98 Danish 1st Division, 1st millennium BC, 1996–97 Danish 1st Division, 1st Brigade (New Zealand), 1st Force Reconnaissance Company, 1st Tactical Missile Squadron, 1st Heavy Mechanized Brigade, 1st of tha Month, 1st GAM: Amai Yuwaku, 2001–02 Danish 1st Division, 1999–2000 Danish 1st Division, 1st Airlift Squadron, 1st Viscount Hampden, 1st Florida Cavalry Regiment, 1st Helicopter Squadron, 1st Panzergrenadier Brigade (Germany), 1st Photographic Group, 1st Armored Brigade (People's Republic of China), 2004–05 Danish 1st Division, 1995–96 Danish 1st Division, 1st Army Corps