 From 1 April 1970 to 30 September 1992, the 4th Airborne Command and Control Squadron (ACCS), part of the 28th BMW, provided airborne command post responsibilities with specially modified Boeing EC-135 airborne command post aircraft for Strategic Air Command.The 4th ACCS was the workhorse of Airborne Launch Control System (ALCS) operations.Three dedicated Airborne Launch Control Centers (ALCC) (pronounced "Al-see"), designated ALCC No.