I'd require new animations. The conversion from how the soldier stands when set on safe to when he is actually firing is very sketchy, with the man pulling the gun off from an imaginary sling. If you were willing to make the three new animations it would work, but having to have the soldiers go from safe, then shoot in the air, then safe, etc. would be to sloppy. You'd be better off doing a flyby and having them do the missing man formation.