What action should you take when indoors and the National Anthem is played while in uniform?

When the National Anthem is played while you are indoors and in uniform, the appropriate action is to face the flag or the music and stand at attention. This reflects the respect and reverence that service members are expected to show towards the national symbol and the anthem, which embodies patriotism and national pride. Standing at attention demonstrates discipline and honors the traditions of the military, reinforcing the connection between service members and their duties to the country.

The other options do not align with military customs and courtesies required in this situation. Saluting the flag is reserved for situations where you are outside and in uniform. Sitting quietly does not convey the respect due during the National Anthem, and simply standing with hands at your side lacks the formal posture of respect that is expected. The correct action underscores the values of duty and respect ingrained in military service.