I seem to remember reading about the Seabees in WWII using armored bulldozers to prepare/repair runways under fire.

Interestingly, if you look at the Wikipedia article on Armored Bulldozers...

https://en.wikipedia.org/wiki/Armored_bulldozer

the first picture shows an Israeli model and it has a birdcage around the armored cab.

The article has pictures of WWII models as well.