Final answer:
All personnel in uniform must salute the flag, except those on official duty who may be exempt from the saluting requirement due to their tasks.
Step-by-step explanation:
When outdoors, all personnel in uniform, except personnel on official duty, must face the flag and salute during the raising and lowering of the flag. The requirement to salute the flag is a mark of respect and part of military protocol. Personnel who are actively engaged in official duties that prevent them from observing this protocol, like those performing required tasks that cannot be paused, are typically excepted from the saluting requirement. A common misconception might be to think that higher-ranking officers or individuals with prestigious awards such as the Medal of Honor may be exempt, but they are required to salute the flag just like other service members when in uniform and not engaged in official duties.