|Normandy Requisitions Officer|
He is not a quartermaster and thus does not issue equipment free of charge: he specialises in equipment outside the Alliance's standard range, trading privately and resupplying whenever the Normandy docks at a reasonably-sized port. This means that Commander Shepard has to pay him for his goods, rather than being issued them on request.
Shepard can also ask the Requisitions Officer about armory licenses. Purchasing new licenses permits the Requisitions Officer to trade in new lines of goods; if Shepard purchases a Geth Armory license, for instance, the Requisitions Officer can sell Geth Armory goods.