An interesting theory but some things just don't add up. Why would Lee Harvey use a post office box to get the gun when he could have walked into any store, given a fake name and got an untracable gun that way? Also if it was Cuba, why did the FBI f*ck the investigation up so much other than Johnson telling them not to? I believe our government helped kill Kennedy but I don't think it would have ever aligned itself with Cuba, espeically in those days