equipment, including the XM-1 tank. The unit assignment and structure changed significantly, notably when 1st Battalion, 9th Cavalry, the division's most famous unit, was inactivated. The 13th Signal Battalion fielded mobile subscriber equipment (MSE), a secure digital communications system for corps and below units. 1st Cavalry Division organization 1989 1st Cavalry Division, Fort Hood (Texas) (Operation Reforger unit. POMCUS materiel depots in Belgium (Grobbendonk, Zutendaal) and the Netherlands (Brunssum, Eygelshoven) and ammunition depot in Zutendaal) Headquarters and Headquarters Company 1st Cavalry Division Band 1st Cavalry Horse Detachment 1st Brigade Headquarters and Headquarters Company 2nd Battalion, 5th Cavalry (Mechanized) 2nd Battalion, 8th Cavalry 3rd Battalion, 32nd Armor 2nd Brigade Headquarters and Headquarters Troop 1st Battalion, 5th Cavalry (Mechanized) 1st Battalion, 8th Cavalry 1st Battalion, 32nd Armor 155th Armored Brigade, Tupelo (Mississippi Army National Guard) Headquarters and Headquarters Company 3rd Battalion, 141st Infantry (Mechanized), McAllen (Texas Army National Guard) 1st Battalion, 155th Infantry (Mechanized), McComb 1st Battalion, 198th Armor, Amory 2nd Battalion, 198th Armor, Greenville 2nd Battalion, 114th Field Artillery, Starkville (24 × M109A3) 106th Support Battalion (Forward), Monticello Troop A, 98th Cavalry, Louisville (19 × M3 Bradley, 3 × M106A2) 134th Engineer Company Cavalry Brigade Headquarters and Headquarters Troop 1st Squadron, 7th Cavalry (Reconnaissance) (Troop B (Ground) inactive) (21 × M3 Bradley, 3 × M106A2, 8 × AH-1S Cobra, 12 × OH-58C Kiowa, 1 × UH-60A Black Hawk) 1st Battalion, 227th Aviation (Attack) (18 × AH-64 Apache, 13 × OH-58D Kiowa, 3 × UH-60A Black Hawk) Company D, 227th Aviation (Command Support) (12 × OH-58C, 6 × UH-1H, 3 × EH-60A) Company E, 227th Aviation (Assault) (15 × UH-60A Black Hawk) Division Artillery (DIVARTY) Headquarters and Headquarters Battery 1st Battalion, 82nd Field Artillery (24 × M109A3) 3rd Battalion, 82nd Field Artillery (24 × M109A3) Battery A, 21st Field Artillery (9 × M270 MLRS) Battery A, 333rd Field Artillery (Target Acquisition) Division Support Command (DISCOM) Headquarters and Headquarters Company 15th Support Battalion (Forward) 27th Support Battalion (Main) 115th Support Battalion (Forward) Company F, 227th Aviation (Aviation Intermediate Maintenance) 4th Battalion, 5th Air Defense Artillery (assigned 16 November 1988) 8th Engineer Battalion 13th Signal Battalion 312th Military Intelligence Battalion (Combat Electronic Warfare & Intelligence) 545th Military Police Company 68th Chemical Company By October 1986 all heavy army and national guard divisions, including the 1st Cavalry Division, had transitioned to the Army of Excellence J-series TOE. Thus the division's tank battalions fielded 58 M1A1