Glory (1989) Directed by Edward Zwick

From Wikipedia: Glory is a 1989 American drama war film based on the 54th Massachusetts Volunteer Infantry as told from the point of view of its commanding officer, Robert Gould Shaw during the American Civil War. The 54th was one of the first formal units of the U.S. Army to be made up entirely of African-American men (apart from the officers).

Trivia: Denzel Washington’s performance earned him the Academy Award for Best Supporting Actor.

A Soldier’s Story (1984) Directed by Norman Jewison

From Wikipedia: A Soldier’s Story is a 1984 drama film directed by Norman Jewison, based upon Charles Fuller's Pulitzer Prize-winning Off Broadway production A Soldier’s Play. A black officer is sent to investigate the murder of a black sergeant in Louisiana near the end of World War II. It is a story about racism and segregation in a black U.S. Army regiment with white officers deep in the Jim Crow South, in a time and place where a black officer is unprecedented and bitterly resented by nearly everyone.

The movie was first shown at the Toronto Film Festival. It won the New York Drama Critics Award, the Outer Critics Circle Award, the Theater Club Award, and three Village Voice Obie Awards. It was also nominated for three Academy Awards: for Best Picture, Supporting Actor (Adolph Caesar as the murder victim), and Screenplay Adaptation.