This performance by John Wayne was probably one of his top 5 performances, The Shootist, The Cowboys, The Searchers, maybe Red River and then Sands of Iwo Jima.
The scenes in camp are the least believable, the apparent lack of coherent structure or directed activity was at odds with my experience in the 70s, and were apparently only written for character development and/or conflict and not for accuracy. Military discipline has never been portrayed accurately in most war movies.
The professional reviewers for this film seem to be somewhat lazy; it’s not about the Army, and the characters are not soldiers, and they’re not marines - they’re Marines, it’s a title not a description of some iguana from the coast of Madagascar. If you don’t bother to understand the subject then don’t write about it.
Oh yeah - it’s Sergeant not Sargeant.
Sgt Stryker’s death on Suribachi was ignoble and accurate to the point that most deaths are not heroic, and there are far more wounded than KIA - the clean one bullet vs the maiming aftermath, topic for another movie.
Wayne’s portrayal of a flawed personality was good, the supporting cast was okay - but just because someone is the son of someone I served with doesn’t mean they don’t get an attitude adjustment for talking smack, this was soft pedaled way too much.
Good movie, entertaining but I’d still rank The Searchers higher as a John Wayne performance.