Where's YORK?!?!
Home of the Brave came out in 1949 staring James Edwards. Red Ball Express co-staring Sidney Poitier 1952. Hell, Roy Glen was in the "The Man in the Gray Flannel Suit" the scene in which Grogory Peck kills his buddy by (Friendly Fire) in 1956. York was William Clark's man-servant (PC slave!)and made invaluable contribution to the expedition on many occasions. Risking his life to save Clark in a flash flood. But I quest that wouldn't sell in 1950's USA?
See the Ken Burn's Doc for an update.
Hack, Woody Strode saved Dorothy Malone in "The Last Voyage" 1960
Hollywood is definitely HIT or MISS opportunities.