The USAF and the RCAF/CFAC also had some nuclear-tipped air-to-air weapons in their inventories, such as the AIR-2 Genie. Canada had them as late as 1984; they were carried by CF-101 Voodoo interceptors. They were officially under US control, but they could be released for use by Canada as circumstances warranted.
In addition to the two big components of the nuclear triad that have already been mentioned – the land-based ballistic missiles and the manned SAC bombers – there was also the third component, the US Navy’s ballistic missile subs. At the opposite end of the scale, the US nuclear inventory includes – if I’m not mistaken – man-portable nuclear demolition charges, designed for things like special commando-type operations. I think a weapon of this type is featured in the 1977 motion picture thriller Twilight’s Last Gleaming.