 FACT: Twice in the movie, the soldiers radio aircraft that they are  releasing smoke of a given color. This is contrary to standard  military practice which is for people on the ground to release  colored smoke without saying what color it is and for the aircraft  to state the color of the smoke. The people releasing the smoke then  confirm that they have indeed released the specified color of smoke.  This is done to avoid having an enemy listening in deceive the  aircraft by releasing smoke of the same color in a different  location.