 The S3 truss also supports EXPRESS Logistics Carrier locations, first to be launched and installed in the 2009 time frame.Major subsystems of the P4 and S4 Photovoltaic Modules (PVM) include the two Solar Array Wings (SAW), the Photovoltaic Radiator (PVR), the Alpha Joint Interface Structure (AJIS), and Modified Rocketdyne Truss Attachment System (MRTAS), and Beta Gimbal Assembly (BGA).The P5 and S5 trusses are connectors which support the P6 and S6 trusses, respectively.