Anyone who has spent more than an hour in uniform knows that there are three pillars of combat effectiveness: competency, cohesion, and trust. Competency involves knowing your job very, very well - whether you are a rifleman or a sonar operator or a flightline mechanic. Cohesion is what gives us teams; teams made up of young people who each know will do their job and if you are yourself injured or in grave danger, you know will come to get you or die trying. Trust can only exist if you have the first two and it is critical to combat or any dangerous operations. You have to know that your leaders are devoted to you, that they know who you are and value you. Trust is knowing that if the first few levels of command are killed or disabled, you will continue the fight well.
These current fads are just that and contradict centuries of experience in preparing young men for war. Direct, infantry, face-to-face combat cannot involve the distractions of sexual couplings, or identified ethnic groups, or covering for weakness and failure points to make some artificial quota.
There is only one point to organizing and training for combat: to kill or convince the enemy to quit and to try to get as many of your own people home as possible.