I've checked today and Col Jopp succeeded Col H E Cilliers as OC Coastal Arty in March 1941. Colonel Cilliers having died in a plane crash. Prior to that Jopp was OC 4 Heavy Battery, The Bluff, Durban. I had the privilege of a semi-guided tour of the remains of the huge gun emplacement at Bluff Base a few years ago.
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