Bogart really has the least interesting part, but he excels at being the crux of the movie and meriting being the guy to whom all eyes turn. It's an effective, oddball role. Of all the films with people of obvious ethnicity pulling together whether in American or Japanese war films, Sahara succeeds brilliantly, betraying neither the prejudices of the period, nor moving too far into caricature. The movie even takes a stab at trashing the "master race" theories of the Nazi's.
Amidst the water retrieval methods and the tense negotiations and full-on battle scenes featuring big guns and deceiving trench-warfare, the stranded Allies still have time to compare cultures and rememberances of home. "The things you learn in the Army," says a smiling Texan to the Sudanese in conversation.
There's your recruitment headline right there.
** Presumably Luger being too German, and Beretta to be used in a 70's cop show and Joe Rifle...sounding as dumb as Joe Gunn, frankly.