You've detected something around the airport. Currently it is probably yellow or unknown, but you know better than that, it must be up to no good just be sitting there. Well in this situation you're probably right but in many scenarios you will need to get a positive ID on your targets. Some devious designers like to put neutral targets right in amongst the bad guys and you don't want to hurt innocents, right! It makes for bad headlines. Well in this case you're pretty sure anyone in the area of the airport is bad so go ahead and take them out.