How to obtain service records (General)
It rather depends how recent the records are , for WW1 it is sadly hit and miss as the records were damaged during WWII (!) - the remains are available via Ancestry.
For WWII and later I think the MoD route is better :-)
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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>