the mil are exempt from the speed restriction. What is the certified strength of the average canopy?
Considerably greater than for a civil transport category aircraft.
Take a look at a FJ forward windscreen. The one on Hawk is about 1.5 inches thick IIRC - and in the birdstrike tests it deformed so much that there was a fear it would strike the HUD when fitted. It's not WW2-style armoured glass against enemy bullets any more, it's for birdstrike.
(Hawk was about 600kts, IIRC - 4 times the typical commerical impact energy levels)