Tip of the Spear from Reach's OST but I extended the cool part and overall just did a lot of editing to make it sound more epic. Original composers: Martin O'Donnell and Michael Salvatori
i keep imagining the intro of tip of the spear as alcohol addicts rushing to a bar since they heard there was a 85% discount, and the covenant shooting at them was the other alcohol addicts shooting at the other alcohol addicts to get that discount for themselves