My partner previously served and as been out nearly 3 years but recently decided he wanted to join the military guards since going back through his application he has been told that on his discharge information it says he was snlr which my partner is totally shocked about because he signed off due to us expecting a baby and had a great final write up from the army so we can’t understand why this has been put on his records or what it even means. My partner was a great member of the army and never got into any trouble so shocked why its there and how we can get it taken off.
Don't panic. SLNR is simply an Administrative term, meaning "OK then he's not strictly required, so he can go" more or less. It isn't the worse case, not at all. There is another term; "Not Required For Further Army Service" which he would have gotten had there been some complaint about him.
Another worse term is/was, "Discharged with ignominy" or "Discharge in Disgrace" but I'm not current with this and it might not be used anymore.