jeh johnson? we'll try to re-establish that and also bring jeh johnson back in the next segment. as we talk about mixed messaging, concerns about the new cdc guidelines on masking that could hurt vaccination efforts where they're needed most. this is andrea mitchell reports on msnbc. ♪♪ t-minus two minutes and counting. ♪♪ um, she's eating the rocket. -copy that, she's eating the rocket. i assume we needed that? [chomping sound] ♪♪ lunchables! built to be eaten. she has eaten the rocket. [girl burps] over. >>> thanks. we've re-established our connection to former homeland secretary jeh johnson. i was asking about the fact that one in five of the people charged with participation in the insurrection had ties to the military, and i'm -- you were top pentagon official. how concerning is that? >> i would say i'm very concerned. in my experience in the department of defense and in the department of homeland security, the overwhelming majority of the military, of the coast guard, of dhs officials are patriotic, conscientious, diligent individuals. we have to accept the real

. >> dickerson: we'll talk with jeh johnson about what those consequences could be. and as americans hit the road and the skies for summer travel, we'll talk with united airlines c.e.o. scott kirby about the industry's recovery. then, after two decades, the u.s. military presence in afghanistan is nearing its end. we'll have a report from kabul. and finally, a look to the heavens, where billionaires are engaged in a space race. it is all just ahead on "face the nation." ♪ ♪ >> dickerson: good morning. and welcome to "face the nation." more than 151 million american adults are fully vaccinated. but just under a third american adults have not had even a single shot, which is worrisome to health officials. the delta variant makes up more than half of all of the new cases. and there is now confusion over the role of the booster shot. we begin with dr. anthony fauci. >> doctor: good morning, john. >> dickerson: let's talk about the delta variant. it seems to make the case for vaccination mor affective, with those that are unvaccinated the most getting infected. is it