I don't know of one called S/F made by Collins. I think that any knife that says "Special Forces" is suspect anyway. You see it on cheap junk as a sales gimmick. I have the Worden SF machete by Ontario. I don't know if any SF people ever used those or not. I much prefer an ordinary machete. The reason I like Collins machetes so much is the spring steel they used. You never see one with a broken blade. They are a bit thicker and heavier than the Tramontinas, but more flexible than the Ontarios. When I would have to take a crew and clear areas with the city I worked for, we would always get the Collins machetes from the local hardware store. None got broken, but many were stolen. Collins was the choice of local surveyors as well. In my opinion, they were the best ever made and have no equals. Now if Jerry makes one in INFI, like a 14" Bushwacker, Collins will have met its match for sure. <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />