以下这一点应该会对你有所帮助：英国特种空勤团是由英国国家安全局（MI5，又称军情五处）和英国陆军情报六局（MI6，又称军情六处）共同训练以承担反间谍任务。
It may help you to know that the SAS is also trained by MI5 and MI6 security and intelligence services to undertake counter-espionage operations .
英国国家安全局