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When a camper arrives at Camp Jupiter, after their meetings with the praetors and the augur, they are expected to give a letter from a former member of the legion. A letter can determine a campers entire life in the legion. Those with the best letters are put in the better cohorts and given jobs, such as messenger. Those with the worst or no letters are put in the lower cohorts and are given jobs such as digging trenches in the Field of Mars or looking after Hannibal.