It would not be racist. Both characters are warriors. Who cares if they both have dark colored flesh.

Tonight on the way home from Krav Maga class, I was thinking that Kato might not recognize Malik with his helmet on. Then I remembered being on a reconnaissance patrol up in Canada about 30 years ago. We had about 5% illumination after the hours of darkness; moon light with overcast skies. I knew my platoon sergeant was kneeling next to me because of the smell of his breath. He was a smoker and it was horrendous. So, Malik's would be the only shape he would not recognize. There is always something about people you work with all the time that renders recognition. Even in MOPP-4 I could still recognize friends.