In my career, I had a knife on the end of my rifle twice. Once in basic when we did bayonet training, and at the end of basic for graduation. Although I did see the Rangers had fixed bayonets when they assaulted the commandancia during Just Cause, but we are talking about the Rangers (bless their hearts). I see little application for the bayonet today, except maybe as an "intimidation factor" for the national guard during civil unrest type of ops.