Shaun O'Donohue, 41, left 63-year-old Edward Cummings permanently scarred after the incident in Bo'ness, West Lothian.
A war veteran lost his job with a leading offender-support charity after slashing a man with a carving knife, a court heard.
He said he would "show Mr Cummings what he was going to do with it". Then he "slashed it down his cheek in one motion". The incident occurred about 5.20 pm on June 5th last year . Solicitor Lynn Swan, defending, said the offence had serious consequences for O'Donohue. "Regretably, as a result of this conviction for an offence of violence, he is not able to continue with that employment."
"He left the RAF in 2008. He has suffered trauma, and was diagnosed in 2018 with complex post traumatic stress order.
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