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You have to speak to Garrus in the Normandy's engineering deck 3 times and ask him about C-Sec and his history. You can speak to him when you leave the Citadel for the first time and after you complete each of two of the primary mission worlds. Afterward the freighter MSV Fedele will be marked in the Herschel system of the Kepler Verge cluster. The assignment is straightforward and is very short.