One old Army trick that may have fallen out of use was to give a troublemaker a tape. If he proved useless it was swiftly removed but in some cases it revealed leadership potential. From personal experience I know of one of the last National servicemen (a particular Bolshie) who even became a regular and went on for a full career ending as a WO.
Germans used to do the same. I remember reading about this one bolshie guy they made Corporal and he ended up in charge of the Army.....