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from what i remember a military man is suicidal, there’s a scene with him having a shotgun? in his mouth but then decides to turn rogue and blows up the base. scenes i remember also include him hiding in a closet in a girls office, i think he breaks the neck of an unsuspected visitor while in the office and puts bombs on a plane to blow it up.

Edited comment

Can you recognise it from this list? (Maybe you could recognize the actors from the cover.)
https://www.imdb.com/search/title/?title_type=feature,tv_movie&genres=action&keywords=gun-in-mouth&sort=release_date,asc