The Substitute (1996)

IMDB
Genre : Action, Crime, Drama, Thriller
TRAILER
Director : Robert Mandel
Stars : Tom Berenger, Raymond Cruz, William Forsythe, Luis Guzmán
Plot : Shale's Mercenary team is retired after a (not so) covert mission in Cuba. He becomes a substitute teacher at his teacher fiancee's Miami high school to get those behind kneecapping her. His team helps him.