Deleting/Removing attached objects

In my vertical shooter game (SWF link here: http://www.megaupload.com/?d=PPF3192Y), I attach bullets (aka duplication with attachMovieClip) and flags. Both do certain things fine (the flags progress to the left horizontally; the bullets up). The enemy (the flags) is contained in a var, the bullets not. How can I execute a hitTest so that when the two collide, they both delete? (FLA link here: http://www.megaupload.com/?d=H4LBGTHE). Thanks so much. Email me at esoltas at gmail.com if necessary.