Nevermind the unfortunate title, one of the main roles of Sergeants and Lieutenants was to keep the ranks of a battle line tight and closed. Giving only NCO's and CO's an ability to "grab", and then personally rearrange a private or something would be useful when forming up or drilling, and in battle.
I understand this could be abusable, so I'd suggest allowing players to break the hold, as well as grabbed, and being moved soldiers can continue shooting based tasks. Soldiers being moved by superiors would probably be moved at half or three quarters of quicktime.