What is the only command that can be given from parade rest?

The command that can be given from parade rest is "Attention." From the parade rest position, this command instructs individuals to return to a position of attention, which is a fundamental military posture characterized by standing straight with arms at the sides and feet together.

The command "Attention" is vital in military formations and drills as it signifies readiness and discipline. When given this command, each member of the unit must execute the transition swiftly and accurately, demonstrating their ability to follow orders.

Other options, while relevant to commanding personnel, do not serve as commands that can be directly executed from parade rest. "Stand at ease," for example, is a command that allows for a more relaxed posture than attention but does not apply as a transitional command from parade rest. Similarly, "At ease" and "Fall in" represent different stages of command structure and cannot connect directly in the context of transitioning from parade rest.