As a young, 16-year old CCF(Navy) cadet, I went on a camp to Ballykelly in about 1966.
We were flown in a Shackleton - Mk2, Phase 3 - important because the Mk2 had a tail wheel, so was still a "proper" Shack - but Phase 3 meant it had an upgraded galley. Hope I have got that right - no doubt some expert out there will correct me if I am wrong!!
My lasting memory, other than being able to sit at the front playing with the gun to shoot down any Messerschmitts that I saw, or having a doze in the "tail-gunner's" position at the back - still looking for Messerschmitts - was being given a steak sandwich very shortly after take-off, and eating for most of the 8 hours we were airborne.
Heaven for a 16-year old!!