The US military does not need greater diversity. It needs an ever more excellent system for identifying and promoting its best leaders. Those leaders can be any race, so long as they are the best, their troops follow, and they win.
The military is not about diversity. It is ONLY about WINNING the nation’s wars. In war, there are no second chances.
Think of it this way:
A PC, “diverse” military might be one which would come to Zer0’s aid in the event of a popular revolt and would have no compunction about firing on patriotic American citizens.
By the same token, such a military might be useful to 0 should he decide to try to make himself “President for Life.”