After an exhausting session with Victoria's Secret Police, John
Carrier blurted out:

Structural design starts getting to be a small problem above 9G (which
implies 13.5G prior to overload), but 9G is about it from the operator
standpoint. You can endure more for a short while, but not while performing
actions other than enduring the G. Even the fittest of the Viper drivers
don't pull max G for long periods.

Down at the centrifuge at Brooks AFB, they had a picture of a gal that
had the "honor" of receiving the "elephant award." She held the record
for 15 Gs and not going to sleep, 15Gs was computed to be the
equivalent of having an elephant stand on your chest.

They also showed a video of a viper guy spinning at 9 Gs carrying on a
simulated air-to-air dialog...this guy was a squatty body.

The day before I got to ride the spin-n-puke, two FWS F-16 IPs both
went to sleep during their rides. Too much fun in San Antonio the
night prior.

Pulling 9 Gs was the least favorite part of the FCF profile for me.
Few years back (10 away from the F-16) I was surprised that 3-4 Gs in
a T-6G felt "heavy."

Juvat