Dumb tags question

#1
Lo folks

I've just been taking a look and my late fathers dogtags.

They're of the round disk variety.
The first 4 lines I understand Blood group, service number, Surname and initials. But the last line I'm at a loss with: "CS"
Logic tells me its his rank, but CS is not an acronym I'm familiar with.

Anyone know?
 

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