See excerpt from article by Pietro Filipponi of The Daily Blam!: James Earl Jones will cameo in the film, reprising his role as Admiral Greer. Kevin Costner has signed on for the role of CIA Agent William Harper, the man who recruits and mentors Ryan as well as John Clark -- the main character in director Christopher McQuarrie's upcoming film Without Remorse. Harper will serve to tie the Jack and Clark franchises together...
See the article entitled: 'It's Time to Drop Kevin Costner's 'Bad Actor' Label' by Julian Spivey: http://thewordwebzine.webs.com/filmarticles.htm