I find that last observation very interesting. Decades ago, my Reserves unit was extremely diverse compared to every IT environment I've ever worked in since then. I had a female sergeant, a black SFC platoon leader... In my civilian career I had exactly one female superior and I worked with exactly three black people, ever, so far, as numerous people have noted IT is super non-diverse.

The prevailing strategy in the civilian world to improve things, under the assumption that non-diversity is bad, seems to be to bring the diversity numbers up, surely achieving military support unit levels of diversity is numerically impossible but a little higher would be realistic, and pounding out bad behavior although surely not as effectively as the military pounds out bad behavior. Then things will magically be better. Apparently at least sometimes that strategy is unsuccessful as the military is obviously vastly far superior to civilian environments by both metrics yet the result is not superior.

Of course there might be sample size anecdotal issues, etc.

If the observed primary civilian strategy is measurably and comparatively a failure mode, then what strategies DO work?