The position of at attention, or standing at attention, is a military posture which involves the following general postures:[1]
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 civilian marching 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.
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.
In Russia and countries of Soviet influence, on the command of attention, the soldiers of any sized unit snap their heads to the front, with their chin up and looking straight ahead.[2]
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.
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]