In the late 1990s when Canada was largely removing itself from United Nations peace support endeavours, private military and security companies were heralded as likely replacements. Canada has indicated its desire to reengage in a United Nations peace support milieu in which there is now a private military and security presence. It is not the type of presence initially envisioned, but it is one with multiple impacts regarding training and operations. This article emphasizes the interventions in the first decade of the twenty-first century and the corresponding, defensively minded regulations that came about in the private military and security industry. The article reveals that commercial logics are now insinuated in United Nations peace support operations and the private military and security presence therein is indicative of a larger shift in United Nations activities towards insularity and protection.