I am trying to unravel my late father’s career in the RAF during the war. He was LVH Horrigan 1577094, a wireless operator in the RAF from July 1941 to June 1946. I have a copy of his service record but I can’t understand some of the acronyms and the significance of them. Also, was a period of 2 ½ years between enlisting and joining an operational squadron usual? If anyone can offer any information or explanations I would be grateful. Below are chronological extracts from his service record. 25.7.41 Birmingham (Why Birmingham when he lived in Scunthorpe?) 26.7.41 from Birmingham to res 13.11.41 From res to 3R.C. Then 10 (S) R.C. (undated) 5.3.42 4 Sigs. School 4.6.42 Uxbridge (SDL) R.C. of Sigs. (A) (Royal Corps of Signals?) 18.1.43 SDL Uxbridge 18.1.43 Regents Park (Undated) 2 R.S. 2.6.43 From 2 R.S. to 7 A.G.S. (Air Gunnery School – have a photograph) 24.6.43 From AGS to 3 (O) A.F.U. 3.8.43 18 O.U.T. (Operational Training Unit?) 27.10.43 From 18 O.T.U. to 1662 C.U. (Conversion Unit at Lindholme?) 20.2.44 1 L.F.S. (Lancaster Finishing School?) 1.4.44 1662 C.U. 1.4.44 Joined 101 Squadron (I am aware of ABC etc.) 22.6.44 Posted Missing W CAD (what does that mean?) then reclassified POW I have already found information about his aircraft, the raid it was on when it was shot down, the POW camp and the ‘Long March’.