The Vanguards and most of the military went back that night.
Since the rift was already cleared, there was no reason for them to hang around anymore so they've already pulled out from the island.
Some of the military personnel were left behind to do the cleanup and securing the corpses of the Anomalies for transport but aside from them, most of them had already left.
Originally, they wanted to leave even more people behind but Olivia rejected the idea as we still weren't sure if there were spies that could have infiltrated into the military as well.
In fact, part of the reason why we let the military join us was so that we could check if any of them might try to assassinate me which would confirm the presence of spies within our own military.
Fortunately, that didn't happen though it could also just mean that they were not activated to do so or they did not get the opportunity to even make an attempt.
Either way, we still can't trust anyone else right now.
