Originally Posted by Otto the Otter

I seem to recall, way back when, reading a letter to the editor in either the one and only Joe comic I ever read, or, more likely, in a Punisher comic, where one of the readers asked why Frank Castle never joined with the Joes for a mission and the reply was that because of the nature of G.I.*JOE and the whole Hasbro thing, that they couldn't do crossovers.