F-16GUY,
Having spent 41 years flying Air-to-Air and Air-to-Ground in 2 seat ac there is absolutely NO acceptable reason why one or both F15s did not detect the Voyager both visually and on the array of electronic devices at their disposal. If I were their Wing Commander I would be asking serious questions.
Equally, if you are receiving a radar service you would hope to be told that the AAR track was active AND receive traffic information if it became a factor. As mentioned previously, is poor training, lack of currency, too much simulation or poor procedures the reason that the control (or lack of control) was so poor?