Apparently Calvin volunteered for the hatch assignment, according to what he told Desmond, so probably military or ex-military personnel were asked to volunteer for a top-secret assignment in conjunction with the Dharma Initiative for scientific experimental studies or something. But it seems like Calvin was posted there for so long without any contact that he wanted off the island in the worst way. He probably thinks that they've forgotten him but since he knew how important it was to keep pushing the button he tried to trick Des into doing it.
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