Help required please. I've started to try and understand my grandads service records but I've got stuck at the first hurdle. I think that I have interpeted a couple of the abbreviations but the others dont make sense. Is there a connection between the Registration Number and the Army Number? Do the sets of numbers in the Army number cross reference to a regiment or are the commas just used to seperate the 000s? 5. I presume that the AC next to Nature of Engagement refers to Army Contract? 10. I think that Z.K mext to Industry Group is Local Government - is this correct. 11. What is L22.2 next to Occupational Classification? 14. My Grandad was born and lived in Sheffield so is there a reason why it states Hawick Scotland as his home town C. Medical Category - I understood that A4 refers to someone under 19 but my Grandad was 30 at the time. F. What do the numbers mean against this section. 19. I cant work out what it says next to 19. Location On the 2nd image -which I presume to be the reverse of the 1st - can someone help to explain what all the hand written text means What does Posted TO 'Y' LIST mean? Thanks in anticipation and apologies to the more experienced of you if the answers are obvious.