Federal Government regulation for pilot restraint system in all model, current fighter aircraft is to be replaced every 5 years! These pilots go from 9 positive to 9 negative g's. These aircraft set in the sun on the tar mat much more thatn any of our race cars are parked or raced in the sun. Any explaination for that one? I personally asked Carl Olson that years ago in the SFI office in Rancho Bernardo. His answer, "please leave my office"!