What are the two bugle calls played at retreat?

The correct answer is the combination of the bugle calls "Retreat" and "To the Color." Retreat is a call that signals the end of the duty day and typically brings an end to daily activities. It is played in conjunction with “To the Color,” which is a ceremonial call played as the national flag is lowered to honor and respect the flag as it is taken down for the day. Together, these calls emphasize the traditions and respect associated with the American flag and are an important aspect of military protocol, reinforcing the values of discipline and honor within the armed forces.

Other options don’t accurately represent the specific calls associated with the retreat ceremony. For example, "Charge" and "Reveille" serve different purposes in military duty routines, while "Assembly" and "Taps" are not part of the retreat signal, and "Adjutant" and "Recall" pertain to different commands unrelated to the ceremony. This underscores the significance of understanding the context of each bugle call within military traditions.