If they get into extremely close quarters fighting perhaps they'll be able to run the enemy through with the edge of their hand.
The current stubby bayonet mounted on the end of a 14 1/2" barrel M4 is not the useful item that soldiers had with a big 'ol pigsticker on an M1, M14, or M1903. The polymer stock on the other end of the weapon doesn't make much of a club either.
My opinion is that our services will be better off getting up to speed with Semper Fu-type empty-hand and knife-fighting systems.