Nobody has to say or do anything. Acronyms, names and how they are used are simply part of our organizational culture as a military. And most particularly of those serving at the time.
Nobody goes around saying "Canadian Joint Operations Command". We say "Seee - Jock". Nobody goes around saying "Canadian Special Operations Forces Command". We say "Can - sof - com". I am just noting that in this case, people are not really saying the first part of the acronym. The short hand that seems to have caught on is " Jay - Eff - see".
I remember a push a while back to get whole air force to stop saying "1 CAD" and say "One Canadian Air Division", from some prudish general who thought "cad" was offensive. He tried to make fetch happen and didn't get very far. And now we have "1 CAD" and "2 CAD".