The above stance position is common in most military organizations throughout the world. It may also be adopted by paramilitary organizations, law enforcement, and other organizations requiring a loosely military structure such as Scouts, cadet programs, or police units, or even the Salvation Army.
It is also used in common in civilianmarching bands, fife and drum corps and drum and bugle corps. To stand at attention is also a means of saluting when a junior rank meets an officer or superior but he (the junior) is not wearing a cover.
By country
United Kingdom and British Commonwealth
In the United Kingdom, New Zealand Defence Force and Australian Defence Force, feet are at a 45-degree angle with heels together. In the Canadian forces, feet are at a 30-degree angle with heels together. Standing at attention is also a critical component of any audience when the Canadian national anthem (O Canada) is being played. It is considered very disrespectful to not stand at attention while O Canada is being played.
Russia and Commonwealth of Independent States
In Russia and countries of Soviet influence, on the command of attention (Russian: Смирно; Smer-nah), the soldiers of any sized unit snap their heads to the front, with their chin up and looking straight ahead.[2]
Spain
In the three armies of Spain this order must be given after the aling up. When the drill gives the order, the soldiers, who must be in the aling up posture, snap their heads to the left and, after the executive order «¡Mar!» or «¡Ar!» they lower the arm that would have been extended to keep the distance with the soldier in front, keeping both arms at sides of the torso. When soldiers are in uniform, the fists must be clenched, covering the gap between the index finger with the thumbs, keeping the knuckles against the legs. If the soldiers are in civilian or sports clothing, the arms are held the same, but the hands are held open and must slap the leg when the executive order is given.
United States
In the United States military, the feet are at a 45-degree angle with heels together and the fingers are curled in a loose fist. Contrary to the norm of the chin being up, the chin is instead down and the neck vertical.[3]
Other nations
Finnish Army, the distance between the toes should equal the width of two fists.