I saw this on HBO in the mid '80s and I loved it. Tommy Lee Jones was so cool and I had no problem buying the premise. It was kind of like Assault on Precinct 13 or The Warriors in its cartoonish depiction of violence. I remember especially the part where he's in full military garb and grease paint on his face with an arsenal of weapons around his body and he tells a woman to leave the park because its filled with "thugs and perverts and weirdos." Check it out if you can, it won't change your life, but it's good.