Aah, yes, those early morning recce briefs!
Many years ago, our support heli sqn was based in central West Germany.
Our marine exchange officer decided to go through a phase of recognition of SHIPS (not a ship for miles around unless the Red Navy's plan was to sneak up the Rhine from the south).
After a few days of slides of similar looking ships, the same old question was asked (no-one had got one correct yet) "What is THIS vessel type?"
"B zero eighty!" came an authoritative reply from the rear of the room.
"B-zero-80? wazz that?" said the marine.
A hairy old pilot got up and walked towards the door. As he passed by the chalkboard, he wrote the letters B-O-A-T and continued through the door into the hangar.......
