Hooah, is not really a chant though. It's more like a universal one word response.
"Let's go to the d-fac and get some chow!"
"Hooah!"
"Make sure you do a complete PMCS on your vehicle before the next convoy."
"Hooah."
And if you want to show how motivated you are to the visiting general, and why I hate the "word" hooah.
"How are you doing today soldiers?"
"HOOOOOOOOOOAH!"