It is the same in the army. It is one of the hurdles that makes blacks so rare in special operations units.
I did not know that. Not too old to learn something new everyday.
For years the Navy lagged the other services in the percentages of black members. That had a lot to do with the fact that many black people just don't care for swimming or being in the water in general. Not stereotyping. I've had blacks guys tell me that and express NO interest in sailing the high seas in the Navy. But I think it is less that way now than twenty or thirty years ago.