- Sean Penn as 1st Sgt. Edward Welsh
- Adrien Brody as Cpl. Geoffrey Fife
- Jim Caviezel as Pvt. Robert Witt
- Ben Chaplin as Pvt. Jack Bell
- George Clooney as Capt. Charles Bosche
- John Cusack as Capt. John Gaff
- Woody Harrelson as Sgt. William Keck
- Elias Koteas as Capt. James 'Bugger' Staros
- Jared Leto as 2nd Lt. Floyd Whyte
- Dash Mihok as Pfc. Don Doll
- Tim Blake Nelson as Pvt. Brian Tills
- Nick Nolte as Lt. Col. Gordon Tall
- John C. Reilly as Sgt. Paul Storm
- Larry Romano as Pvt. James Mazzi
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- John Savage as Sgt. Roy McCron
- John Travolta as Brig. Gen. David Quintard
- Arie Verveen as Pfc. Charlie Dale
- Kirk Acevedo as Pvt. Mike Tella
- Penny Allen as Witt's Mother
- Mark Boone Junior as Pvt. Christopher Peale
- Paul Gleeson as 1st Lt. George 'Brass' Band
- Don Harvey as Sgt. Rodney Becker
- Danny Hoch as Pvt. Alex Carni
- Thomas Jane as Pvt. Jason Ash
- Miranda Otto as Marty Bell
- John Dee Smith as Pvt. Paul Train
- Nick Stahl as Pfc. Howard Bead
- Matt Doran as Pvt. Coombs
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