KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, workers guide the Multi-Purpose Logistics Module Leonardo as it is lowered toward the Cargo Element Work Stand that Raffaello recently vacated. The payload canister was a temporary location during the switch. Three MPLMs were built by the Italian Space Agency - Donatello, Leonardo and Raffaello - to serve as a reusable logistics carrier and primary delivery system to resupply and return cargo requiring a pressurized environment to the International Space Station.