Image at right: Locations for external attached payloads on the International Space Station, ITS S3 and ITS P3 are port and starboard Integrated Truss Segments for the attachment of Express Logistics Carriers (ELCs). Instruments can also be attached to the COF-EF and JEM-EF the Columbus Orbiting Facility-Exposed Facility, and Japanese Experiment Module-Exposed Facility. Image credit: NASA
Image at right: The Window Observational Research Facility (WORF) rack ready for flight to the International Space Station. The protective hatch has been removed, allowing access into the instrument volume. Once in orbit, the rack will be fitted over the optical quality window in the Destiny U.S. Laboratory Module. Image credit: NASA