sentences:  His next call was to NORAD's second-in-command, Slemon, then located in Cheyenne's counterpart at CFB North Bay.While the call was being connected, the alert status went to level 4, and then 5, indicating the BMEWS site was almost positive an attack was underway, and giving Slemon the authority to order the immediate release of SAC's Airborne Alert force for attack on the USSR.By the time the call was connected, Brigadier General Harris Hull, NORAD's chief of intelligence, joined the call.