MGM constructed replicas of Fort Knox (KY) and Fort Lewis (WA) on its back lot.
"Lux Radio Theater" broadcast a 60-minute radio adaptation of the movie on
January 4, 1943 with Wallace Beery reprising his film role.
The song Wallace Beery sings as he marches on horseback with his group is not the more famous song "She Wore a Yellow Ribbon" appearing in the movie of the same name (She Wore a Yellow Ribbon (1949)). It dates back to the Civil War, and there are many variations of it. The first known copyright of a version (listed in the soundtrack section) was in 1917, by George A. Norton.
The halftracks shown in the opening sequence--so called because they had wheels in the front and tracks in the back--are the M3 Personnel Carrier, with production beginning in 1940.