When John and Bailey are meeting Oscar in the prison, he enters the room with his left arm in a sling. Before he sits down, he comments to Bailey that "if I could raise his arm above my head, I would salute you."
In almost all cases you salute with your right arm, not your left. And none of the exceptions would apply here.
In almost all cases you salute with your right arm, not your left. And none of the exceptions would apply here.