Bataan, ahead of its time for casting race. . .
Look at the names of this group of volunteers. You have Slavic, Irish, Jewish, Phillipine, Hispanic, and African Americans all represented. That is an impressively fair group of heroes by 1940's standards in my book.
Feingold, Malloy, Matowski, Katigbak, Salazar, Ramirez.
Much more, the minorities aren't degraded. The black character Epps is not the cook for example, but mans one of the machine guns.
Compare this to Saving Private Ryan where you have what. . . White, Irish, Jewish, and Italian?
I know some of the people play into stereotypes, but this movie was more integrated than the rest of society/military at the time.