Okay Advice: When you hear "Heavy Ammo Inbound" Find your teammates and huddle together in an open area. Avoid anything purple. It's insta-death. When huddled together for around 30 seconds everyone will start discharging heavy ammunition from their posteriors. This is how you obtain rockets and LMG ammo. Remember : Ammo Inbound, find teammates, huddle in an open area, wait. Good luck Guardians. May your posterior supply endless ammunition.