That's been around since 1953 (less than a decade after the first atomic detonation in '45). [1] And we've maintained a limited number of low-yield warheads th

That's been around since 1953 (less than a decade after the first atomic detonation in '45). [1] And we've maintained a limited number of low-yield warheads that would fall under that designation. [2] (as an example) [1] http://en.wikipedia.org/wiki/Nuclear_artillery http://en.wikipedia.org/wiki/Nuclear_artillery [2] http://en.wikipedia.org/wiki/B61_nuclear_bomb http://en.wikipedia.org/wiki/B61_nuclear_bomb