One of my favorite authors, Mark Berent, wrote an awful lot about F100's and their ops out of Bien Hoa during the first years of the war in Vietnam - Very in depth stuff about air to groud/close air support missions, as well as the weapons, tactics, navigation, refueling, and threats from AAA, as there were few SAMs if any in the South were most of the F100's operated from the base he was located on. I love the "Hun" myself, it was my first model I was ever given, that plus Berent's first book "Rolling Thunder" of which the F100 played such a large role, has always made the F100 very interesting to me.
The Navy guys call the F8 Crusader the "last of the gunfighters", and in many ways, the F100 is similar for the Air Force IMO - both had 4 20mm single barrel cannons. Maybe Widewing will stop in and give some insights into the differences between the Colt guns on the F8 and the Pontiac revolver cannons on the F100.