I watched a PV2 use the bayonet and scabbard to cut concertina wire out from underneath his HMMWV at NTC.
Seems that the OPFOR made good use of it to canalize the young joe into a "minefield". He veered off his path to avoid the tank ditch and took the wire option instead.
All I can say is that his hands looked like hamburger......and the bayonet had little effect on cutting the wire.
Also been privy'd to have one on the rifle for the change of command and inpspecting arms rooms.