First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Fighter Brigade, 1st Senate district, 3rd Battalion, 1st Marines, Royal 1st Devon Yeomanry, 1st Division, 1st Rifle Division, 1st Armoured Infantry Brigade (United Kingdom), 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Word, 1st Theater Sustainment Command, 1st Squadron, 1st Cavalry Regiment, 1st Reconnaissance Squadron, 1st Hussars, 1st Marine Expeditionary Brigade (United States), 2nd Battalion, 1st Marines, 1st Brigade, 1st Marine Regiment (United States), 1st Armored Division (United States), 1st Michigan Infantry Regiment, 1st Arkansas Infantry Regiment, 1st Marine Division, 1st & Ten, 1st Brigade Combat Team, 1st Infantry Division (United States), 1st Maryland Cavalry Battalion, 1st Brigade Combat Team, 1945–46 Danish 1st Division, 1951–52 Danish 1st Division, 1st Distribution Support Battalion, 1st Artillery Regiment, 1946–47 Danish 1st Division, 1947–48 Danish 1st Division, 1955–56 Danish 1st Division, 1952–53 Danish 1st Division

1st Arkansas Cavalry Regiment, 1st Kentucky Infantry Regiment, 1949–50 Danish 1st Division, 1948–49 Danish 1st Division, 1950–51 Danish 1st Division, 1st Kentucky Cavalry Regiment, 1954–55 Danish 1st Division, 1st Bombardment Wing, 1st Missouri Infantry Regiment, 1953–54 Danish 1st Division, 1st Engineer Regiment (Italy), 1st Constitution Bancorp, 1st Louisiana Infantry Regiment, 1st Airborne, 1st Maryland Infantry Regiment, 1st Air Defense Artillery Regiment, 1st Battle Squadron, 1st Delaware Infantry Regiment, 1st Brigade (Australia), 1st Armoured Brigade (United Kingdom), 1st Division (Thailand), 1st ward, Chicago, 1st Louisiana Cavalry Regiment, 1st (UK) Division, 1st Brahmans, 1st Belorussian Front, 1st Horse (Skinner's Horse), 1st Combat Engineer Battalion, 1st Division (Australia), 1st Colorado Infantry Regiment, 1st Airborne Command Control Squadron, 1st Parachute Division (Germany), 1st (African) Division, 1st Infantry Division (United States), 1st Medical Brigade, 1st Infantry Regiment (United States), Francis Cook, 1st Viscount of Monserrate, 1st Georgia Infantry Regiment, 1st Cavalry Division (United States), Ōita 1st district, 1st Armored, 1st Canadian Parliament, 1956–57 Danish 1st Division, 1st Expeditionary Rescue Group, 1st Armored Division (France), 1st Royal New South Wales Lancers, 1st Anti-Aircraft Brigade, 1st Light Car Patrol (Australia), 1st Infantry Division (France), 1st Fighter Wing

First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Fighter Brigade, 1st Senate district, 3rd Battalion, 1st Marines, Royal 1st Devon Yeomanry, 1st Division, 1st Rifle Division, 1st Armoured Infantry Brigade (United Kingdom), 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Word, 1st Theater Sustainment Command, 1st Squadron, 1st Cavalry Regiment, 1st Reconnaissance Squadron, 1st Hussars, 1st Marine Expeditionary Brigade (United States), 2nd Battalion, 1st Marines, 1st Brigade, 1st Marine Regiment (United States), 1st Armored Division (United States), 1st Michigan Infantry Regiment, 1st Arkansas Infantry Regiment, 1st Marine Division, 1st & Ten, 1st Brigade Combat Team, 1st Infantry Division (United States), 1st Maryland Cavalry Battalion, 1st Brigade Combat Team, 1945–46 Danish 1st Division, 1951–52 Danish 1st Division, 1st Distribution Support Battalion, 1st Artillery Regiment, 1946–47 Danish 1st Division, 1947–48 Danish 1st Division, 1955–56 Danish 1st Division, 1952–53 Danish 1st Division, 1st Arkansas Cavalry Regiment, 1st Kentucky Infantry Regiment, 1949–50 Danish 1st Division, 1948–49 Danish 1st Division, 1950–51 Danish 1st Division, 1st Kentucky Cavalry Regiment, 1954–55 Danish 1st Division, 1st Bombardment Wing, 1st Missouri Infantry Regiment, 1953–54 Danish 1st Division, 1st Engineer Regiment (Italy), 1st Constitution Bancorp, 1st Louisiana Infantry Regiment, 1st Airborne, 1st Maryland Infantry Regiment, 1st Air Defense Artillery Regiment, 1st Battle Squadron, 1st Delaware Infantry Regiment, 1st Brigade (Australia), 1st Armoured Brigade (United Kingdom), 1st Division (Thailand), 1st ward, Chicago, 1st Louisiana Cavalry Regiment, 1st (UK) Division, 1st Brahmans, 1st Belorussian Front, 1st Horse (Skinner's Horse), 1st Combat Engineer Battalion, 1st Division (Australia), 1st Colorado Infantry Regiment, 1st Airborne Command Control Squadron, 1st Parachute Division (Germany), 1st (African) Division, 1st Infantry Division (United States), 1st Medical Brigade, 1st Infantry Regiment (United States), Francis Cook, 1st Viscount of Monserrate, 1st Georgia Infantry Regiment, 1st Cavalry Division (United States), Ōita 1st district, 1st Armored, 1st Canadian Parliament, 1956–57 Danish 1st Division, 1st Expeditionary Rescue Group, 1st Armored Division (France), 1st Royal New South Wales Lancers, 1st Anti-Aircraft Brigade, 1st Light Car Patrol (Australia), 1st Infantry Division (France), 1st Fighter Wing, 1st Source, 1st Fighter Squadron, 1st Arkansas Consolidated Infantry Regiment, 1st Cavalry Regiment (United States), 1st Low Altitude Air Defense Battalion, 1st (Peshawar) Division, 1st Pontieri Regiment, 1st Civil Affairs Group, 1st Earl of Suffolk, 1st Foreign Regiment (France), 1st Test and Evaluation Squadron, 1st Mobile Corps, 1st Special Operations Squadron, Joseph Maclay, 1st Baron Maclay, 1959 Danish 1st Division, 1st Provisional Marine Brigade, 1960 Danish 1st Division, 2002–03 Danish 1st Division, 2003–04 Danish 1st Division, 1st Earl Temple, 1st Airlanding Brigade (United Kingdom), 1st Battalion, 5th Marines, 1997–98 Danish 1st Division, 1st Air Cavalry Brigade, 1st millennium BC, 1958 Danish 1st Division, Captain 1st rank, 1st Canadian Division, 2000–01 Danish 1st Division, Komandarm 1st rank, 1st Force Reconnaissance Company, 1st Marine Aircraft Wing, 1st Marine Logistics Group, 1996–97 Danish 1st Division, 1st GAM: Amai Yuwaku, 1999–2000 Danish 1st Division, 1995–96 Danish 1st Division, 1st Time, 1st Armoured Division (Australia), 2001–02 Danish 1st Division, 1st Ski Division (Wehrmacht), 1st Strategic Aerospace Division, 1st Health Battalion (Australia), 1st Aviation Regiment (United States), 1st Guards Brigade (Croatia), 1st Florida Cavalry Regiment, 1st Regiment, Royal Australian Artillery, 1st Army Corps, 1st Viscount Hampden, 1st Armored Brigade (People's Republic of China), 1st Minnesota Infantry Regiment, 1st Air Fleet, 1st Panzergrenadier Brigade (Germany), 2004–05 Danish 1st Division, 1998–99 Danish 1st Division, 1st Commonwealth Division, Active Privy Councillor, 1st class, 1st Heavy Mechanized Brigade, 1st Alabama Cavalry Regiment, 1st Tactical Missile Squadron