Military Parade, North Korea

A formation must be brought to the position attention before it can go to a lower state alert.
Commonwealth Nations countries allow four states alert:
Attention: standing straight, eyes forward, chest out, shoulders back and down, knees straight but not locked, heels together, feet at a 30-degree angle (540 mils). All muscles are rigid. The hands are held in tight fists with the thumbs aligned with the seam the trousers.
At Ease: a modified position attention in which the left foot is moved to shoulder width (typically measured as exactly 12 inches) and the hands are placed behind the back with arms fully extended. The right hand is placed inside the left with all fingers together and pointing rigidly downwards. U.S. military usage is "Parade Rest."