I bring this up, because how could Master Chief be loyal to an army of equal amounts of Asians, Blacks, and Whites? What about Mexicans, as I see similar such type of people in Halo 3. If these subspecies were presented as 1 species in Halo, the narrative wouldn't strike as boldly. There organically would be too much thought of infighting and competition. Even after the Elites teamed up with the Humans in Halo 3, they returned to their home planet, Sanghelios. Halo is a story of strident loyalty.
And in addition, the marines, like I said earlier, don't look too fancy. They are raw soldiers, raw sacrificers as it is seen. Even Master Chief's armor design looks blatantly raw and unclean. He looks very brute in Halo 2-3's armor, and in Halo 1 where the story is introduced, he appears more spiritual and curvy, like a purpose is imprinted in his armor. Later he is faced with the reality of war, and his armor changes. Halo 4's armor sucked and the story should've ended at Halo 3, left as an open legend.
There is also the godliness of Halo. Some people have called it a Christian allegory. The Halos, which represent the wages of sin. Flood, which represents sin. The Covenant, which represents Judaism. The Brutes are clear portrayals of current day black people, jackals are hyper-jews, grunts are degenerates, Elites are powerful people who are abused by the Jewry, and eventually rebel. Drones, which are insectoids, are a tough enemy to beat when they swarm in numbers, I think they represent the organically evil nature of mass-produced technology. Master Chief is Jesus, coming down to redirect all life, not just the evil, into Godly order. Except, the story is much more European, more viking-like than it is semitic as the story of Jesus is. Instead of Master Chief giving his shirt as well and turning the other cheek, he imposes with brute force and impeccable discipline the will of God. The survival of good humanity, which is largely synonymous with white humanity, even against the most evil enemies.
In the end, Halo is just Halo, and it is a great story of loyalty, of Godliness, and of whiteness.