That is interesting. Any details on that?
I am asking because I have seen tactical nukes (they weren't strategic unless I have the definition wrong) and they were bombs that a carrier launched plane would have to carry.
They were way bigger than anything else ordnance-wise, no idea of the yield.
Something as small as a 155mm sounds extremely dangerous to handle and could easily fall into the wrong hands.
If you want footage on Upshot Knothole I know someone who offers that footage. You will have to contact me privately for that. Here are a good link:
http://en.wikipedia.org/wiki/Nuclear_artillery