https://www2.zoechip.com/watch-movie/heartbreak-ridge-18187.2508416
1983. Thomas Highway (Clint Eastwood) is a well-decorated career military man in the United States Marine Corps, he who has seen action in Korea and Vietnam. His current rank is Gunnery Sergeant. His experiences have led him to become an opinionated, no nonsense man, who is prone to bursts of violence, especially when he's drunk, if the situation does not suit him, regardless of the specifics or people involved.

Because of these actions, he has spent his fair share of overnighters behind bars. Close to retirement, one of his last assignments, one he requested, is back at his old unit at Cherry Point, North Carolina, from where he was transferred for insubordination and conduct unbecoming. He is to train a reconnaissance platoon. His superior officer, the much younger and combat inexperienced Major Malcolm Powers (Everett McGill), sees Highway as a relic of an old-styled military.

Highway's commanding officer, Lieutenant Ring (Boyd Gaines), the platoon leader, is also a younger man who has no combat experience, but is academically inclined and happy-go-lucky. Highway finds that his team is a rag-tag bunch of slackers, who includes wannabe rock musician Corporal Stitch Jones (Mario Van Peebles), with whom Highway had an inauspicious earlier meeting. The men in the platoon, who truly believe Highway is crazy, hate him, and don't understand why they have to follow his harsh training regimen when the United States is not currently at war.

The Major, who is all about efficiency regardless of combat readiness, has the same views of Highway. He is clear that he sees Highway's platoon solely as a training mechanism for his own elite squad trained by Highway's nemesis, Staff Sergeant Webster (Moses Gunn). Things for Highway and his platoon change when the United States enters into war in Grenada. Through it all, Highway tries to reconnect with his bar waitress ex-wife Aggie (Marsha Mason), he even clandestinely reading women's magazines to understand her better. Two primary obstacles stand in his way: Roy Jennings (Bo Svenson), Aggie's boss and current suitor who hates Marines, and Aggie's own remembrance of how dysfunctional their marriage was.

From IMDB:

A sharp and "very" witty film.

Watching Clint Eastwood work his magic on the big screen is something for a movie lover like myself to treasure and in "Heartbreak Ridge", Eastwood really unleashes it here.

Eastwood stars (and directed) the film as Thomas "Gunny" Highway, a very seasoned and highly decorated, but a troublesome U.S. Marine gunnery sergeant. Highway begins what may be his last tour of duty and along the way, he deals with a rowdy and undisciplined bunch of recruits (Mario Van Peebles being the most sarcastic and cocky one among the bunch) and turns them into reliable soldiers, Major Powers (Everett McGill), a higher-ranking officer who totally dislikes Highway, and tries to revive his relationship with Aggie (Marsha Mason), his ex-wife who isn't afraid to tell him about the misery that she has suffered.

The film runs at a brisk pace and Eastwood saves the best scenes for last when he guides the squad into Grenada to find a medical school where the students (mostly Americans) are held captive and the shootouts are well-done. Plus, the humor in this film is sharp and very witty although some of it may be offensive.

"Heartbreak Ridge" does remind me of the one film that I've seen made by the late Samuel Fuller - "The Big Red One". There are a few differences that seem notable, but both films bear a strong resemblance and appeal.