What position should personnel in uniform assume upon the first note of "Retreat"?

When "Retreat" begins to play, personnel in uniform are required to assume the position of "Attention." This position signifies respect and is a military tradition during the playing of the national anthem or formal music, which is a moment meant for honoring the flag and the values it represents, as well as those who serve under it.

At "Attention," individuals stand with a straight posture, arms at the sides, and eyes forward, demonstrating discipline and respect. The transition to "Attention" from a position of "Parade rest" or "At ease" reflects an acknowledgment of the significance of the ceremony and the national symbols involved.

In contrast, "At ease" involves a more relaxed stance, which would not be appropriate during the formal playing of "Retreat." "Standby" is a command typically used to prepare personnel for an upcoming instruction but does not pertain to a specific position. Therefore, the correct response directly aligns with the military protocol for honoring the flag during such ceremonies.