Not My Relative
 

This guy is not my relative,but his name and service number are in a book i have.
His name, rank and service No is,Anderson R. M. Sgt,37525,5th a/tank coy.
Any one tell me about this guy and where he served ??.
Also inside the back cover is Capt R A Selby 5th a/tank coy.
The book is manual of driving and maintenance for mechanical vehicles (wheeled) 1937,reprinted 1940.
thanks in advance.

not my rellitive
 

Ok really all i need to know is where the service number is from in the commonwealth.