The Delta Force (1986)

[hownos]

Why did this movie have so many big names in the cast?

[Allaby]

According to google AI: The 1986 action film "The Delta Force" garnered a strong cast, featuring Chuck Norris, Lee Marvin, and a supporting ensemble of recognizable actors, partly due to the film's premise of being "based on reality" and the production company Cannon Films' reputation for action films. The film's premise, inspired by the hijacking of TWA Flight 847, added to its appeal and helped attract actors. Cannon Films, the production company, was known for its action films and had a reputation for assembling strong casts for their projects.

(That sounds like a plausible explanation to me.)