You have to wonder whether some of those brought back to the US are Peace Corps volunteers who were serving in or near the affected areas. And of course there are the US military advisors Obama has sprinkled over the African continent, too, who come to mind as well.
The military and federal employees are always involved in Ebola outbreaks, just not as rank and file soldiers or clinic operators.
Since it is a State Dept.contract we can safely assume that diplomats and family have priority flying ambulance evacuation. Might be a visiting VIP there, but if they’re really VIP’s they wouldn’t be there, would they.
African head of state is a possibility.