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Today, commitment is difficult, if not impossible: we live in a world of “individualism of disconnection” (according to Marcel Gauchet), one that is more gaseous than solid. Once upon a time, commitment was automatic, today it has become a problem. We therefore need to relearn it, to revisit its foundations and its successive layers. Here we will distinguish between two commitment “models”: “sign-up commitment” (modeled on a contract) and “engagement commitment” (modeled on an alliance). The former, more “modern” than the latter, can be withdrawn, it is limited in time, while the second form adds an “ethical weight” to one’s “word”—one that is given and forms an engagement. This makes for a better understanding of the commitment made by service men and women and its specificities: a vocation, a feeling for the corps one joins, the shared common values.