he says isis isn't even the most dangerous threat to the united states right now. that dubious honor belongs in his view to russia. let's talk about this with retired army colonel peter mansour, former aide to general petraeus. odierno says if things don't change in the fight, he thinks the u.s. should consider embedding u.s. troops but he also says that that doesn't mean they would be fighting. what does it mean? >> these would be combat advisers assisting commanders and crafting plans and arranging low jgistics and calling in air strikes near the front lines. they wouldn't necessarily be trigger pullers but would be in the action and they would be assisting iraqi units. >> if we embed u.s. troops which obviously barack obama has resisted to this point, does that threaten to also mean the united states then effectively takes over the fight against isis rather than leaving it as