One notible area where that is not true is vocational education. In our state a voc ed teacher needs at least three thousand hours in their field to be considered for certification. In my case I also had a BS in electronics engineering and 9 years in the USAF as well as 12 years in aerospace experience.
The highest compliment I could received was "You're not like my other teachers".
The DoD has an excellent program, Warriors to Teachers, that receives little support through the districts that I am familiar with.
Bump that! Recruit people with ACTUAL SKILLS to impart same to our children.
I would imagine because the ex-military applicants would be mostly male, and mostly conservative, entering an environment dominated by very liberal women.