 In some cases (Argentina, Chile), this has been a long-term historic commitment of a few (3-6) observers in missions that have been supported from the late 1940s to date.In other cases the support has taken the form of major units (at least a battalion in the range of 500-700 personnel), generally for periods of a year.This Latin American support effort has accelerated in the past few years as the UN has taken a more activist and interventionist stance in the peacekeeping field (with some key individuals calling for the UN to be prepared to do peace-enforcement as well as peace-keeping).