There are a few possibilities:
* You may be thinking of the 2000 movie "Rules of Engagement" starring Samuel L. Jackson and Tommy Lee Jones. This film deals with a controversial military incident and has garnered a lot of attention.
* There may be a movie titled "Rules of Engagement" from 1989 that isn't widely known. You could try searching for it on movie databases like IMDb.
* You may have mixed up the title or year. It's possible you're thinking of a different film entirely.
Could you please provide more information about the movie you're looking for?