First 1st Battalion, 1st Marines 1st Cavalry 1st Reconnaissance Battalion 1st Operations Group 1st Mounted Division 1st Fighter Brigade 1st Division 1st Regiment 1st Senate district 3rd Battalion, 1st Marines Royal 1st Devon Yeomanry 1st Rifle Division 1st Armoured Infantry Brigade (United Kingdom) 1st Brigade Combat Team, 1st Cavalry Division (United States) 1st Word 1st Pennsylvania Regiment 1st Hussars 1st Squadron, 1st Cavalry Regiment 1st Reconnaissance Squadron 1st Marine Regiment (United States) 1st Theater Sustainment Command 1st Battalion, 4th Marines 2nd Battalion, 1st Marines 1st Belorussian Front 1st Brigade 1st Armored Division (United States) 1st Brigade Combat Team, 1st Infantry Division (United State…

es) 1st & Ten 1st Michigan Infantry Regiment 1st Brigade Combat Team 1st Airborne 1st Artillery Regiment 1st Marine Division 1st Bombardment Wing 1st Air Defense Artillery Regiment 1st Constitution Bancorp 1st Brigade (Australia) 1st Division (Thailand) 1st Missouri Infantry 1st Minnesota Infantry Regiment 1st Armored 1st Armoured Brigade (United Kingdom) 1st Airborne Command Control Squadron 1st Delaware Infantry Regiment 1st Battle Squadron 1st Division (Australia) 1st (African) Division 1st Combat Engineer Battalion 1st Canadian Parliament 1st Light Antiaircraft Missile Bat

talion 1st Horse (Skinner's Horse) 1st Infantry Division (United States) 1st Expeditionary Rescue Group 1st Colorado Infantry Regiment 1st Fighter Squadron 1st Infantry Regiment (United States) 1st Georgia Infantry Regiment Francis Cook, 1st Viscount of Monserrate 1st Royal New South Wales Lancers Oita 1st district 1st Fighter Wing 1st millennium BC 1st Cavalry Division (United States) 1st Foreign Regiment (France) 1955–56 Danish 1st Division 1st (Peshawar) Division 1st Anti-Aircraft Brigade 1st Light Car Patrol (Australia) 1st Marine Expeditionary Brigade (United States) 1st Source 1947–48 Danish 1st Division 1st Test and Eval