Historically, from 1967–1998, the ALCC mission was performed by United States Air Force Boeing EC-135 command post aircraft.
The ALCS crew is integrated into the battle staff of the USSTRATCOM "Looking Glass" Airborne Command Post (ABNCP) and is on alert around-the-clock.
2 was dedicated to orbiting near the Minuteman ICBM Wing at Malmstrom AFB, Montana, providing ALCS assistance if needed.
Today, at least one E-6B Looking Glass Airborne Command Post (ABNCP) is on alert around the clock performing the ALCC mission.
Just like its original inception, ALCS on alert today provides an adversary with an insurmountable task of trying to destroy the Minuteman ICBM force.