I hope you've made a will...
The Russians have their MnogoNukes
. The Americans ensure Peace Through Superior Firepower
via their 5,113 nuclear warheads (September 2009), of which about half are in storage.
As the most powerful military on the planet and one of the most frequently appearing in fiction, the Yanks with Tanks
have their most capable weapons easily to hand. The fact they like to Nuke 'em
We're again breaking down delivery systems via type. The US defence industry has merged and de-merged a great deal since 1945 (Rockwell and McDonnell Douglas are now part of Boeing, Northrop and Grumman merged a while back, Lockheed and Martin-Marietta did as well, and several other examples) and so manufacturer names aren't included.
Welcome to a world of Titans, the deadly Davy Crockett and some concepts: