Final answer:
The senior detail member commands "Order, ARMS" when the national anthem ends during the lowering of the flag ceremony, which is a practice reflecting respect for the nation and its symbols.
Step-by-step explanation:
When lowering the flag, during the first note of the national anthem or "To the Colors," detail members who are not involved in lowering the flag should execute present arms. The correct moment when the senior detail member is expected to command "Order, ARMS" is when the national anthem ends or "To the Colors" is played through. This moment of respect coincides with the conclusion of the anthem, which is a common practice during flag ceremonies to show honor and respect for the nation and its symbols. Watching the stars and stripes lower while the anthem plays can be a profoundly patriotic experience, embodying a nation's pride and solemn respect for its flag.