"....you know what's going to happen and you know it's not going to be pleasant. "
Reminds me of an impending visit from the in-laws! :sweat_smile:
Order Arms goes back to the 18th century (when the command was "order your - FIRELOCKS", and before that. From the 'order' position, the command to 'rest' 'at ease' or 'parade rest' given as required.
The command "present - ARMS!" was used because as well as the firelock or musket, there was the bayonet and also edged weapons such as swords and the half pikes carried by Serjeants and officers.
Presenting arms was done as a salute - the weapon held out so that it could be taken and inspected by the commander, should he choose to do so; with the advent of shorter breech loading weapons, the 'inspection' was changed to a port arms (rifle held diagonally across the body) stance and present arms retained for salutes.
Every musket drill I have worked with has the soldier return his musket to the shoulder once loaded, both for safety and as a visual signal that he has loaded.
The Order posture goes back at least to the start of the 17thC, it appears in Jacob de Gheyn's Wappenhandlinghe, it works for both pikes and muskets.