The Importance of F-106 Interdiction - was National Security:
Ulis can scoff all he wants. The fact remains (a) the Cooper Hijacking raised national security issues resulting in (b) a response and interdiction of the hijacked plane by USAF F-106's whose primary mission was to protect US Security assets ... and everyone including the pilots flying Flight 305 were aware of the need to stay within acceptable flight restrictions. They were NOT free to roam around the skies or do anything they wanted; and that is an understatement which could have resulted in dire consequences irrespective of the hijacker's threats and purported bomb!
Recent interviews with people involved make that clear. One such interview was recently done by Bruce Smith titled: Interview with a SAGE radar operator as investigations intensify in the DB Cooper Case - May 11, 2019. In this interview a member of the 1971 SAGE team David Morgan, who was stationed at McChord Air Base in Tacoma, WA comments specifically as follows:
"Morgan gave me an interesting military perspective on the Cooper skyjacking. He and many others at McChord were concerned that Cooper might use the airplane as a weapon and fly it into a military installation, or a nuclear reactor, such as the Hanford reactor and its supply of plutonium. Morgan was quite passionate about this possibility, (from a military perspective) and acknowledged it presaged by thirty years the fears now borne by 9-11. In fact, he indicated that the primary purpose of the pursuit planes, the so-called “alert birds,” was to shoot down Cooper and his airplane if he strayed too close to a military installation, or gave indications that he might crash the aircraft into a critical civilian (or military) site."
With that perspective in mind, controller Cliff Ammerman and the others involved, had an important task on their hands. A very real mission with two F-106's primed, loaded, and ready should the need arise. It was important to control and direct everyone to a successful non-military outcome.
Under these conditions knowing where 305 was and what it was doing, was of critical importance.
Likewise knowing that the hijacker was still on board, or not, and what the hijacker was doing, or not doing, was of equal importance.
Ammerman told me that he was never personally involved in any discussions about whether the hijacker was still on board or not, but that others were so involved. Cliff said that had the need developed he would have been given any information necessary to the performance of his duties. At 7:54 pm we have this exchange: MSP: As soon as reasonably sure the man has left the quicker you can land. - 305: Roger. Miss Mucklow said he apparently has the knapsack around him and thinks he will attempt a jump. - MSP: Roger. After leaving this freq go to 131.8 we have direct phone patch there (to Company and FBI).
Can we assume the F-106s broke off with 305 after the threat had diminished or was over - according to someone's estimate as the plane left Portland airspace heading south toward Eugene. The F-106's could have been refueled in the air, or joined by other tactical fighters but that did not happen either. The perceived mission complete the F-106's were withdrawn and allowed to leave near Eugene, according to controller Ammerman. Can we assume somebody thought the air threat to national security was over - as appraised by others? From Eugene south no tactically armed mission escorted 305. What was the basis of that decision?