s134e007533 (5/20/2011) --- View of the Alpha Magnetic Spectrometer - 2 (AMS-2) mounted on the S3 Truss segment. The EXPRESS (Expedite the Processing of Experiments to Space Station) Logistics Carrier 2 (ELC2) is also visible behind the AMS-2. Photo taken during STS-134 and Expedition 27 joint operations.