This issue of Brasiliana takes a critical look at Brazil's engagement in UNPKO missions, bringing together papers on a variety of subjects, such as: Brazilian participation in PKO (both from a military and a diplomatic point of view); internal repercussions of external military engagements; effectiveness and consequences of this Brazilian participation in UNPKO (also regarding international relations); papers that critically relate the Brazilian participation in UNPKO to the internal public security policy in Brazil; and finally, articles that discuss and evaluate whether there is a Brazilian way of carrying out peacekeeping operations.