Just an aside, a for instance, ask a reenacting artillerist how they justify their unit's #4 at-ready stance.
You'll get: facing forward, or facing backward, or standing forward and twisted backward, then with lanyard arm fully-extended ready to employ a body weight fall away, or lanyard arm cocked and ready to "snap" the lanyard, or lanyard arm fixed behind the back ready to twist or fall away, or lanyard hand held to pants ready for a knee buckle.
Some want #4 facing forward to help verify muzzle flash and battlefield dynamic; some want #4 facing backward to visually verify the command to fire.
Though nobody will tell them, newbys eventually learn that any one of those variations may be equally valid. It's understanding what the current drill is --whatever it is -- that matters most.