Never started a fight but I've ended a few.
Fight only when someone lays their hands on me and then there are no rules.
Mouthy people get put down verbaly and they are safe physicaly as long as they keep their hands off.
I suppose the worst I did to someone was drive a ballpoint pen into their forearm when they tried to grab me , fights with me are usualy over very quickly since I realy know how to hurt people if I choose to (I prefer not to) and I have no reservations about using weapons to PROTECT myself and others. That was the main reason for joining the Army.