Final answer:
In a quick time march, the swing of arms is 9 inches forward and 6 inches back, providing balance, coordination, and uniformity in the marching unit's appearance and movement.
Step-by-step explanation:
The swing of arms in a quick time march is 9 inches forward and 6 inches back. In a quick time march, the motion of the arms is deliberate and measured to maintain uniformity and rhythm within the marching unit. This precise movement also helps with balance and coordination as each person steps in time with the others. The arm swings are an important aspect of the visual and functional discipline in military and cadet marches, providing momentum as well as a sharp, cohesive appearance to the formation.