First 1st Battalion, 1st Marines 1st Cavalry 1st Reconnaissance Battalion 1st Operations Group 1st Mounted Division 1st Division 1st Fighter Brigade Royal 1st Devon Yeomanry 1st Regiment 3rd Battalion, 1st Marines 1st Senate district 1st Rifle Division 1st Armoured Infantry Brigade (United Kingdom) 1st Word 1st Brigade Combat Team, 1st Cavalry Division (United States) 1st Hussars 1st Pennsylvania Regiment 1st Theater Sustainment Command 1st Reconnaissance Squadron 1st Marine Regiment (United States) 1st Squadron, 1st Cavalry Regiment 1st Battalion, 4th Marines 1st Brigade 2nd Battalion, 1st Marines 1st & Ten 1st Armored Division (United States) 1st Brigade Combat Team, 1st Infantry Division (Unite…
ed States) 1st Airborne 1st Brigade Combat Team 1st Artillery Regiment 1st Bombardment Wing 1st Michigan Infantry Regiment 1st Marine Division 1st Air Defense Artillery Regiment 1st Brigade (Australia) 1st Division (Thailand) Ōita 1st district 1st Constitution Bancorp 1st Belorussian Front 1st Armored 1st Missouri Infantry 1st (African) Division 1st Armoured Brigade (United Kingdom) 1st Infantry Division (United States) 1st Airborne Command Control Squadron 1st Delaware Infantry Regiment 1st Battle Squadron 1st Minnesota Infantry Regiment 1st Division (Australia) 1st Horse (Skinner's Horse) 1st C
ombat Engineer Battalion 1st Expeditionary Rescue Group 1st Canadian Parliament 1st Fighter Squadron 1st Georgia Infantry Regiment 1st Fighter Wing 1st Infantry Regiment (United States) 1st Light Antiaircraft Missile Battalion 1st (Peshawar) Division 1st Colorado Infantry Regiment Francis Cook, 1st Viscount of Monserrate 1st Foreign Regiment (France) 1st Cavalry Division (United States) 1st Special Operations Squadron 1st millennium BC 1st Light Car Patrol (Australia) 1st Marine Expeditionary Brigade (United States) 1st Test and Evaluation Squadron 1st Royal New South Wales Lancers 1952–53 Danish 1st Division
1st Battalion, 1st Marines
1st Cavalry
1st Reconnaissance Battalion
1st Operations Group
1st Mounted Division
1st Division
1st Fighter Brigade
Royal 1st Devon Yeomanry
1st Regiment
3rd Battalion, 1st Marines
1st Senate district
1st Rifle Division
1st Armoured Infantry Brigade (United Kingdom)
1st Word
1st Brigade Combat Team, 1st Cavalry Division (United States)
1st Hussars
1st Pennsylvania Regiment
1st Theater Sustainment Command
1st Reconnaissance Squadron
1st Marine Regiment (United States)
1st Squadron, 1st Cavalry Regiment
1st Battalion, 4th Marines
1st Brigade
2nd Battalion, 1st Marines
1st & Ten
1st Armored Division (United States)
1st Brigade Combat Team, 1st Infantry Division (United States)
1st Airborne
1st Brigade Combat Team
1st Artillery Regiment
1st Bombardment Wing
1st Michigan Infantry Regiment
1st Marine Division
1st Air Defense Artillery Regiment
1st Brigade (Australia)
1st Division (Thailand)
Ōita 1st district
1st Constitution Bancorp
1st Belorussian Front