5 Railway Training Regiment (my guess is that this may have been at Longmoor in Hampshire.)
Port Wing (Again, a guess, that this was part of the same setup at Longmoor, obviously with the emphasis on dock working.)
12 DR (possibly Docks Regiment)
He was then struck off the strength of 12 DR and embarked in the UK for the Middle East Land Forces, as part of draft DCATG - these were random letter codes to denote specific bodies of men (drafts) which were to be moved together to overseas locations.
Embarked in UK and was taken on the strength of MELF. This is fairly standard practice, that once he had boarded the troopship he would have been held on the strength of the receiving unit even though he wouldn't physically be with them about 9 days. This would start his entitlement to any overseas allowances, and separation allowance if he was married at the time. He then disembarked in ME and transferred to BTD - some sort of Depot I suspect.
