The Eagle Eyes program
The Eagle Eyes program is an Air Force anti-terrorism initiative that enlists the eyes and ears of Air Force members and citizens in the war on terror. Eagle eyes teaches people about the typical activities terrorists engage in to plan their attacks. Armed with this information, anyone can recognize elements of potential terror planning when they see it.
One category of suspicious behavior includes:
Deploying assets: People and supplies getting into position to commit the act. This is a person's last chance to alert authorities before the terrorist act occurs. Look for people loading up vehicles with weaponry/explosives, etc, and/or parking that vehicle somewhere, or people in military uniforms (who don't look right) approaching an installation or getting into a vehicle, or people who seem out of place standing by at a certain location as if waiting for something to happen. One fairly good example of this is the attack on the Khobar Towers in Saudi Arabia. When the explosives-laden truck pulled up to the fence line (which was the "deploying assets" step) and the driver jumped out and ran away, that was seen by a spotter on the roof of the dormitory, who recognized this as suspicious activity. He then sprinted down stairs and began pounding on doors, rousting people out of bed and getting them out of the building. Because of that, he saved many, many lives, and it's all because he recognized the "deploying assets" element.