Some countries used to restrict the validity of some passeports they issued to some countries. E.g. some eastern block countries would have a field in their passport "this passport is valid for travel to the following countries:" and then eather list all communist countries or state "all over the world".
Today it's rarer to see such a field in a passeport.
Also there is always the Israel issue, but they must be used to it, and probably this is not an issue, they would just dispatch you anywhere else.