Essays / Help with argumentive essay on Canadians peacekeeping [4]

So I have to write an argumentative essay on Canadians peacekeeping in foreign countries (Cyprus, Rwanda, Somalia, Bosnia, Croatia) and I have to argue whether Canadians should or shouldn't be peacekeeping in foreign countries. I have to have 3 main arguments, but I can't think of three solid ones for either yes or no.

Can you give me some ideas for 3 main points for either the yes or no side of the argument?