In its attempt to endure in a geopolitical context radically different from that which had presided over its inception more than 60 years ago, NATO has been offered a new agenda, principally originating from the United States. The latter are thus actively hoping that their European partners will agree that NATO must transform to be able to intervene where Western interests are at stake and to be in charge of all problems that may affect international security if need be. Europeans may approve Washington-inspired NATO objectives, yet they cautiously refrain from concretely applying the resulting consequences. In spite of its undermining inner contradictions, NATO’s perennity seems guaranteed. While the link between armies and nations is dangerously slackening in Europe, NATO provides armed forces with an agenda, action and causes to defend.