Guys - please! The Seals vastly over-estimate both themselves and their abilities. Yes, a emp would work but not for long, same with a bunch of missles, even nukes. It would raise havoc for sure, if it ever got started, but they would be stopped pretty quickly if not well beforehand and it wouldn't be by a bunch of Marines, either. Good ol joe citizen would put up with that nonsense for just so long and then that would be it - the ng can pick up the pieces.
The toughest part would be the aftermath. Martial law would be established which is probably what their true focus would be - to establish martial law and put the military in charge until the government can get straightened out and in those areas hardest hit, emergency services would have to be provided. Many areas could expect to be lawless and when food begins to run out you can expect trouble but this won't last forever and I seriously doubt the US will revert to a bunch of separatist areas. Whether DC gets taken out or not, a central federal gov't will continue to exist attempt to regain control. State gov'ts will marshall emergency services and, one way or another, law and order will be retored. This doesn't mean for a moment that you should not be prepared for a series of disasters or that you should not have sufficient means to feed and defend yourselves. Not for a moment.
Oh yeah - I don't care how many Navy Seals they think it would take to bring somethibng dumbazz like this off but they can't be too awful smart or they would have learned from my war that when they are standing in the door of a flying airplane, wearing a parachute, and feeling my boot on their butt, that they stop singing Anchors Away or Aweigh or whatever and keep their mouths shut or get a mouthful of bird poo. They also seem to have forgotten, that to those of us trained to survive, a seal is part the of the food chain.... Oh yeah, Starkist.............