System Safety Working Group系统的安全工作小组 Southend-on-Sea Wargames Club (Essex, UK)Southend-on-Sea Wargames俱乐部(英国埃塞克斯) System Security Working Group系统安全工作小组 Survivor Support Working Group幸存者支持工作小组 Software And Standards Working Group软件和标准工作组