First 1st Battalion, 1st Marines 1st Cavalry 1st Reconnaissance Battalion 1st Operations Group 1st Regiment 1st Mounted Division 1st Fighter Brigade 1st Division 1st Senate district Royal 1st Devon Yeomanry 3rd Battalion, 1st Marines 1st Armoured Infantry Brigade (United Kingdom) 1st Rifle Division 1st Brigade Combat Team, 1st Cavalry Division (United States) 1st Word 1st Hussars 1st Pennsylvania Regiment 1st Theater Sustainment Command 1st Reconnaissance Squadron 2nd Battalion, 1st Marines 1st Brigade 1st Squadron, 1st Cavalry Regiment 1st Battalion, 4th Marines 1st Brigade Combat Team, 1st Infantry Division (United States) 1st Armored Division (United States) 1st & Ten 1st Marine Regiment (United Stat…
tes) 1st Michigan Infantry Regiment 1st Brigade Combat Team 1st Distribution Support Battalion 1st Airborne 1st Artillery Regiment 1951–52 Danish 1st Division 1945–46 Danish 1st Division 1949–50 Danish 1st Division 1948–49 Danish 1st Division 1st Marine Division 1946–47 Danish 1st Division 1st Bombardment Wing 1947–48 Danish 1st Division 1952–53 Danish 1st Division 1955–56 Danish 1st Division 1950–51 Danish 1st Division 1954–55 Danish 1st Division 1st Brigade (Australia) 1st Air Defense Artillery Regiment 1st Constitution Bancorp 1st Division (
Thailand) 1953–54 Danish 1st Division 1st Minnesota Infantry Regiment 1st Missouri Infantry 1st Delaware Infantry Regiment 1st Armored 1st Airborne Command Control Squadron 1st Belorussian Front 1st Armoured Brigade (United Kingdom) 1st Battle Squadron 1st (African) Division 1st Division (Australia) 1st Combat Engineer Battalion 1st Infantry Division (United States) 1st Light Antiaircraft Missile Battalion 1st Horse (Skinner's Horse) 1st Colorado Infantry Regiment 1st Expeditionary Rescue Group 1st Infantry Regiment (United States) 1st Canadian Parliament Ōita 1st district 1st Georgia Infantry Regiment 1st Fighter Squadron 1st Royal
1st Battalion, 1st Marines
1st Cavalry
1st Reconnaissance Battalion
1st Operations Group
1st Regiment
1st Mounted Division
1st Fighter Brigade
1st Division
1st Senate district
Royal 1st Devon Yeomanry
3rd Battalion, 1st Marines
1st Armoured Infantry Brigade (United Kingdom)
1st Rifle Division
1st Brigade Combat Team, 1st Cavalry Division (United States)
1st Word
1st Hussars
1st Pennsylvania Regiment
1st Theater Sustainment Command
1st Reconnaissance Squadron
2nd Battalion, 1st Marines
1st Brigade
1st Squadron, 1st Cavalry Regiment
1st Battalion, 4th Marines
1st Brigade Combat Team, 1st Infantry Division (United States)
1st Armored Division (United States)
1st & Ten
1st Marine Regiment (United States)
1st Michigan Infantry Regiment
1st Brigade Combat Team
1st Distribution Support Battalion
1st Airborne
1st Artillery Regiment
1951–52 Danish 1st Division
1945–46 Danish 1st Division
1949–50 Danish 1st Division
1948–49 Danish 1st Division
1st Marine Division
1946–47 Danish 1st Division
1st Bombardment Wing