I couldn't find the exact paper that chart is from but here's a similar one where you can see performance graphs and the top percentage of women just barely overlap the bottom performing men https://apps.dtic.mil/sti/tr/pdf/ADA302557.pdf
While women can be excellent pilots, they will never rank the top 10% of applicants. If there is a qualified female pilot applicant, there are literally a hundred men who can do it better.
The short answer is: If they don't lower the fitness requirements for women, then women can't be firefighters.
There may be some freakish, high T women (lesbians) who can meet the fitness standard briefly but they can't last out a career of any length.
So any woman firefighter is a diversity hire. Same for fighter pilots.
If you have a physical fitness requirement that will filter out any percentage of young men, it will filter out all women.
Results from US navy damage control drills: https://i.imgur.com/URPjLCQ.png
I couldn't find the exact paper that chart is from but here's a similar one where you can see performance graphs and the top percentage of women just barely overlap the bottom performing men https://apps.dtic.mil/sti/tr/pdf/ADA302557.pdf
Wow several tests have 90%+ of women fail before and still 90%+ fail after training, versus 0% and 0% for men.
Why for fighter pilots?
G forces.
While women can be excellent pilots, they will never rank the top 10% of applicants. If there is a qualified female pilot applicant, there are literally a hundred men who can do it better.
Reaction Time, Spacial Reasoning, and Heart size.
All three very important for fighter pilots, all three areas where sexual dimorphism is very pronounced.