Why do US Air Force fire fighters wear shinny silver bunker gear with a helmet covering unlike the other North American fire fighters seen in cities and towns etc? Why don't they just wear the normal looking bunker gear?
Probably because their duties and responsibilities cover a wider range of things like dealing with aircraft crashes and and responsibilities from enclosed or small places more than what a civilian firefighter's job normally includes.
The silver gear is more effective against extreme heat, as would be experienced in aircraft fires. Pretty much ALL airport fire departments use similar gear.
Because the Air Force is cheap (well, broke is a better way to put it--thanks Congress) and many bases have decided to just buy one set of gear that can be used for both ARFF and structural firefighting.
My base finally just started giving out separate structural gear to its firefighters a few months ago.