I think you're confusing "Orthodox" with "Chareidi". Many Orthodox fought in the War of Independance, and many more in subsequent wars. In fact, today the Orthodox is the only sector of israeli society which fulfills it's military and national servie obligations to the state!
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Jerusalem Old City's Jewish Quarter almost entirely Haredi, study finds