you're going to hear from these two top american officials giving completely different estimates of the percentage of syrian rebels who are the quote, unquote, bad guys here. take a listen. >> we have adapted our approach based on what we know of the opposition. if you recall in the beginning of the year there was a period where it was pretty evident that the extremist groups were prevailing in the opposition. >> i just don't agree that a majority are al qaeda and the bad guys. that's not true. there are about 70,000 to 100,000 oppositionists. about -- somewhere, maybe, 15% to 25% might be in one group or another, who are what we would deem to be bad guys. >> so you hear these two men, joint chiefs chairmen, saying as recently as february the bad guys were prevailing among the opposition. then john kerry saying it's only 15% or 25%. elizabeth, you've been there. you've done all this research. what do you say?