Read an article years ago about a die hard ex-military instructor who had moved on to civy instructing in c172's who absolutely insisted that "Bomb doors closed" be included in his check list. Probably was the same bloke who used to call "Clear 1 " as he started his C150. With blokes like that still in the aviation business it's little wonder LOP operation is taking a while to be universally understood.
Cheers RA