500
On the command MARCH, given as the right foot strikes the ground, the Airman takes one more 24-inch step with the left foot. Then in one count, place the ball of the right foot alongside the heel of the left foot, suspend arm swing, and shift the weight of the body to the right foot. Step off with the left foot in a 24-inch step, resuming coordinated arm swing. The upper portion of the body remains at the position of attention throughout.
What is change step