First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Senate district, 1st Fighter Brigade, 1st Division, Royal 1st Devon Yeomanry, 3rd Battalion, 1st Marines, 1st Rifle Division, 1st Armoured Infantry Brigade (United Kingdom), 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Word, 1st Squadron, 1st Cavalry Regiment, 1st Marine Expeditionary Brigade (United States), 1st Reconnaissance Squadron, 1st Hussars, 1st Theater Sustainment Command, 2nd Battalion, 1st Marines, 1st Armored Division (United States), 1st Brigade, 1st Brigade Combat Team, 1st Infantry Division (United States), 1st Marine Regiment (United States), 1st & Ten, 1st Michigan Infantry Regiment, 1st Brigade Combat Team, 1st Distribution Support Battalion, 1945–46 Danish 1st Division, 1951–52 Danish 1st Division, 1st Artillery Regiment, 1955–56 Danish 1st Division, 1st Airborne, 1947–48 Danish 1st Division, 1st Engineer Regiment (Italy), 1946–47 Danish 1st Division, 1949–50 Danish 1st Division, 1952–53 Danish 1st Division

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

First, 1st Battalion, 1st Marines, 1st Cavalry, 1st Reconnaissance Battalion, 1st Operations Group, 1st Regiment, 1st Mounted Division, 1st Senate district, 1st Fighter Brigade, 1st Division, Royal 1st Devon Yeomanry, 3rd Battalion, 1st Marines, 1st Rifle Division, 1st Armoured Infantry Brigade (United Kingdom), 1st Brigade Combat Team, 1st Cavalry Division (United States), 1st Pennsylvania Regiment, 1st Word, 1st Squadron, 1st Cavalry Regiment, 1st Marine Expeditionary Brigade (United States), 1st Reconnaissance Squadron, 1st Hussars, 1st Theater Sustainment Command, 2nd Battalion, 1st Marines, 1st Armored Division (United States), 1st Brigade, 1st Brigade Combat Team, 1st Infantry Division (United States), 1st Marine Regiment (United States), 1st & Ten, 1st Michigan Infantry Regiment, 1st Brigade Combat Team, 1st Distribution Support Battalion, 1945–46 Danish 1st Division, 1951–52 Danish 1st Division, 1st Artillery Regiment, 1955–56 Danish 1st Division, 1st Airborne, 1947–48 Danish 1st Division, 1st Engineer Regiment (Italy), 1946–47 Danish 1st Division, 1949–50 Danish 1st Division, 1952–53 Danish 1st Division, 1948–49 Danish 1st Division, 1st Bombardment Wing, 1950–51 Danish 1st Division, 1st Marine Division, 1st Constitution Bancorp, 1954–55 Danish 1st Division, 1953–54 Danish 1st Division, 1st Air Defense Artillery Regiment, 1st Brigade (Australia), 1st Missouri Infantry, 1st Division (Thailand), 1st Armoured Brigade (United Kingdom), 1st Belorussian Front, 1st Delaware Infantry Regiment, 1st (UK) Division, 1st Battle Squadron, 1st Airborne Command Control Squadron, 1st Armored, 1st (African) Division, 1st Colorado Infantry Regiment, 1st Infantry Division (United States), 1st ward, Chicago, 1st Combat Engineer Battalion, 1st Division (Australia), 1st Horse (Skinner's Horse), 1st Medical Brigade, 1st Expeditionary Rescue Group, 1st Canadian Parliament, 1st Infantry Regiment (United States), Ōita 1st district, 1st Georgia Infantry Regiment, Francis Cook, 1st Viscount of Monserrate, 1st Anti-Aircraft Brigade, 1956–57 Danish 1st Division, 1st Light Car Patrol (Australia), 1st Fighter Squadron, 1st Infantry Division (France), 1st Cavalry Division (United States), 1st Armored Division (France), 1st Fighter Wing, 1st Royal New South Wales Lancers, 1st Source, 1st Pontieri Regiment, 1st Foreign Regiment (France), 1st (Peshawar) Division, 1st Test and Evaluation Squadron, 1st Special Operations Squadron, 1st Low Altitude Air Defense Battalion, 1st Cavalry Regiment (United States), 1st Brahmans, 1st Maryland Cavalry Regiment, 1st Civil Affairs Group, 1st Provisional Marine Brigade, 1st Air Cavalry Brigade, 1st Earl of Suffolk, 1st Marine Logistics Group, Joseph Maclay, 1st Baron Maclay, 1st Parachute Division (Germany), 1st Battalion, 5th Marines, 1st Earl Temple, 1959 Danish 1st Division, 1960 Danish 1st Division, 2002–03 Danish 1st Division, 2003–04 Danish 1st Division, 1st Airlanding Brigade (United Kingdom), 1958 Danish 1st Division, 1st Wisconsin Infantry Regiment, 1st Ski Division (Wehrmacht), 1st Guards Brigade (Croatia), 1st Canadian Division, 1st Health Battalion (Australia), Captain 1st rank, 1st Marine Aircraft Wing, 1st Aviation Regiment (United States), Komandarm 1st rank, 1997–98 Danish 1st Division, 1st Armoured Division (Australia), 1st millennium BC, 1st Maryland Cavalry Battalion, Potomac Home Brigade, 1996–97 Danish 1st Division, 1st Minnesota Infantry Regiment, 1st Brigade (New Zealand), 2000–01 Danish 1st Division, 1st Commonwealth Division, 1st GAM: Amai Yuwaku, 1st Airlift Squadron, 1999–2000 Danish 1st Division, 1st Strategic Aerospace Division, 1st Force Reconnaissance Company, 1st Viscount Hampden, 1st Time, 1995–96 Danish 1st Division, 2001–02 Danish 1st Division, 1st Tactical Missile Squadron, 1st Missouri Cavalry Regiment (Union), 1st Armored Brigade (People's Republic of China), 1st of tha Month, 1st Regiment, Royal Australian Artillery, 1st Army Corps, 1st Helicopter Squadron, 1st Infantry Regiment (Lithuania), 1st Australian Horse, 1st Photographic Group, 2004–05 Danish 1st Division, Active Privy Councillor, 1st class, 2009–10 Danish 1st Division, 1st Battalion, 227th Aviation Regiment (United States), 1st Air Fleet, 1st Battalion (Australia), 1st West Virginia Infantry Regiment