Rainham boy. Hi my father joined RM in july 1940. I believe most records for an ordinary marine at that time would be pretty bare .
As MaxD has said a record of a posting to particular RM division would mean a marine could end up anywhere as there were so many sub units .
The RMRD ( royal marine reserve depot ) probably exmouth (exton ). is where he would have done his 6 weeks basic training. May have been at the dalditch camp which is/was on the common a couple of miles away from lympstone camp.
When , as a young boy I asked my dad where he was based in the war ...when he said saundersfoot , I laughed,thought he was joking !! But as MaxD said there at least 4 RM bases in wales , at saundersfoot was the RM signals, at penally. RM sniper school. Etc.
After dunkirk the RM were about the only fully equiped. Autonomous unit ( own transport, signals ,artillery etc . Churchill and war cabinet were worried about german invasion from ireland and so moved RM to wales ,later 101st 102nd RM were on standby to invade canary islands if spain entered war .
My dad told me that when home on leave he caught a later train back to camp , his friend from same town ,in same co. Caught an earlier train. When my dad got back the camp was nearly deserted. Turned out units of MNBDO ( mobile naval base defence organiseation ) had been hurridly sent to Crete .his friend survived but spent some years in german prisnor of war camp.
My dad had chevrons for 101st ,102nd. And 103rd brigades. He was all over the place . He told me very little about his time in the marines. If he knew how much trouble, tme and effort I spent piecing together his service history !!!!!!!
One story he told me is that he and other marines. Were ordered to "babysit " a yacht back to uk from. Denmark/ germany that a senior RM officer had taken a likeing to and had" claimed " as spoils of war ........the mind boggles !!!!