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So do you guys remember this popping up when the officer yelled, "FORM A LINE BOYS!" I've seen the formations in the alpha and they sometimes take a while for everyone to line up. So maybe when an officer uses the form a line command privates can walk up to the outline and sort of get locked in place. It can prevent people from bumping into each other when you try and straighten as well.
Just a little thought. Open to criticism.
EDIT: Sorry for the low quality screenshot, I didn't have my pc with me so i used my phone to make this post.