Being new to WW2Talk, I'm not sure if this is how to ask a question, but here goes. Can anyone with knowledge of service numbers tell me what a Z prefix means. I know that a person called Harper (surname) had service number Z374. Does that imply he was in a particular section of the armed services. I'm not even sure if he was from the U.K. Thanks, gjacks. Can anyone please advise how to trace a current or past service person, knowing their service number, given name initials, and surname. Mod edit: merged post & threads.