Bunch of soldiers turn up, shoot all the zombies, and are like, "hey, we're here, don't worry! The US government is back in control!".
Flashforward six months and Alexandria is now a tech-worker suburb of a Google-esque company, and they're all having a mediocre-looking dinner in their front garden. Rick does security, Carl is a programmer, Carol just bakes cookies all day.
Camera pulls away to show a 'NEGAN 2020' poster.