The 158th Aviation Regiment is an aviation regiment of the United States Army. It traces its heritage to the 158th Aviation Battalion. Company A, 158th Aviation Battalion, was activated in the Regular Army on 25 July 1968 at Fort Carson, Colorado; and Company C on the same date at Fort Riley, KS. Both became an element of the 101st Airborne Division. Company A was inactivated on 19 April 1979 at Fort Campbell, Kentucky; Company C on 16 October 1986 at Fort Campbell. Both Companies A and C were redesignated as Battalion HHCs on 16 September 1987, for the 1st and 3rd Battalions, respectively. Structure 1st Assault Helicopter Battalion "Ghost Riders" Company E 2nd Assault Helicopter Battalion Company HHC "Hooligans" Company A "Axe Men" (UH-60) Company B "Big Foot" (UH-60) Company C "Crazy Hawks" (UH-60) Company D "Dark knights" (MNT) Company E "Executioners" (FSC) 7th Battalion Company B Company C (HH-60M) (OR ARNG) Company D Detachment 1 (OR ARNG) Company E Detachment 1 (OR ARNG) Company F 1st Battalion, 158th Aviation Regiment The 1st Assault Helicopter Battalion, 158th Aviation Regiment, nicknamed the "Ghostriders", is headquartered at Conroe, Texas. The battalion flies UH-60 Black Hawks as part of the United States Army Reserve's 11th Theater Aviation Command. The battalion traces its lineage to Company A, 158th Aviation Battalion, activated on 25 July 1968, for assignment to the 101st Airborne Division (airmobile). The division, already in Vietnam, was transitioning from a parachute unit to a helicopter-transported airmobile unit. 2nd Battalion, 158th Aviation Regiment The 2nd Battalion was constituted on 25 July 1968, in the regular army as Company B, 158th Aviation Battalion, nickname "Lancers" an element of the 101st Airborne Division (airmobile), and activated at Fort Carson, Colorado. It was reorganized and redesignated on 16 September 1987, as Headquarters and Headquarters Company, 2nd Battalion, 158th Aviation, and relieved from assignment to the 101st Airborne Division (air assault)(organic elements concurrently constituted and activated), and on 15 September 1996 it was inactivated at Fort Hood, Texas. Headquarters and Headquarters Company, 2nd Battalion, 158th Aviation was redesignated on 16 October 1997 as Company B, 158th Aviation, and activated at Fort Hood, Texas, and then redesignated again on 1 October 2005 as Company B, 158th Aviation Regiment. It was inactivated there on 15 January 2008. On 17 October 2011 it was redesignated as Headquarters and Headquarters Company, 2nd Battalion, 158th Aviation Regiment, and activated at Joint Base