Tank

Zack is a Command Sergeant Major assigned to his last post before leaving the service. He is a colorful character and even on has his own WWII vintage tank that is used for parades and such.

After he stops a deputy from beating a call girl, he finds that he is a marked man in town. The sheriff arrests his son on a trumped up drug charge. When all else fails, Zack uses his tank to even the odds.