CFAO 26-4 : IDENTITY DISCSWEARING7. Identity discs shall be retained by members at all times and worn
around the neck and next to the skin:
a. by members serving on active duty, at sea, or beyond the North
American continent, or engaged in flying duties, or on a military
exercise involving travel by Service aircraft; and
b. by other members when directed by the commander of a command.
TO ANSWER YOUR QUESTION, YOU MUST WEAR YOUR ID DISCS WHEN ON OPERATION OUTSIDE OF NORTH AMERICA OR WHEN FLYING IN A SERVICE AIRCRAFT.