User blog comment:Callofduty4/Black Ops III Zombie reveal at SDCC/@comment-11942878-20150626000116/@comment-24389968-20150626204156

Well, after the map occured, Fidel Castro passed down his presidency of Cuba to his son. Nixon suffered a stroke in his home and died later that day. Robert McNamara died peacefully in his sleep, and JFK took a bullet to the head.

So I don't really see a way the Five crew can return.

https://33.media.tumblr.com/tumblr_m7ewqmH5oT1rylwhfo1_250.gif