The Unknown Warriors

Col. Ronald Lee Alexander. "Alex" for short, is an Army intelligence officer and specialist in weapons of mass destruction. Alex and others like him who offer their protection to us and often make the ultimate sacrifice for our nation are featured, as they try to capture or eliminate the terrorist threat.
In this version of the events of 9/11, an attempt is made on Airforce One, when it returns to Washington.
One of the terrorists who is captured, escapes. Alex gives chase, assisted by various local police agencies.
The terrorist gets to Boston and a safe house. He is joined by another terrorist from Central Europe, with knowledge of how to manufactor WMD. Together they set up a laboratory in the house and fortify their surroundings with guards, dogs, and security devises.
Before the autorities can stop them, they transport the weaponized material to Miami. After learning of their whereabouts, Alex and his team contact the President and are rushed to Miami on a civilian jet. With only a guess as to where and how the WMD might be used, Alex and his team are able to foil the deadly plot. The two masterminds however excape.
One of them is followed into Mexico, where Alex and his team are able to bring him to justice. The other terorrist, escapes. Sometime later, Alex learns of another plot by the terrorist who got away.
This time the terrorist cell has assembled a suitcase size nuclear weapon and Alex's team must locate the devise before it releases its deadly radiation. By the time they find it, there is no time to dismantle the device which is securely contained in a welded metal box. Alex, must find another way to keep the city safe.