A Trident II D5 is my guess. just testing inventory..
http://www.fas.org/nuke/guide/usa/slbm/d-5.htm
Hey, If NKorea can do it..
Yep.
Honestly, I was thinking of this in terms of Ockham’s Razor as well, and the trouble is, I can’t figure out which is more damn likely, us or “them.” However, the Norks may feel they haven’t been getting enough attention by firing missiles over Japan or by torpedoing SorK frigates, so they are upping the ante. Of course, it is in our strategy with them not to give them any indication that they hurt us so it’s... “huh-WAT?” from the Pentagon.