STS-131 (ISS assembly flight 19A) is the mission of Space Shuttle Discovery, targeted for launch 5 April 2010.The primary payload is a Multi-Purpose Logistics Module loaded with supplies and equipment for the station. The mission will also remove and replace an ammonia tank assembly outside the station and return a Lightweight Adapter Plate Assembly (LWAPA) plate, located on the Columbus module. The mission also includes several on-board payloads; this mission has the most payloads since STS-107.The Payload patch is unique in that there is text in on the design for the WORF segment. Quick, IS this unique???