This sound is from Halo Ringtones

Halo Ringtones and sound effects. Halo's sound design is iconic, from the crack of the Battle Rifle to the roar of the Warthog. Weapon and vehicle sounds convey power and lethality, while the ambient soundscape brings the world to life. Specific examples include the metallic clang of Spartan armor, the eerie whine of the Flood, the triumphant Halo theme music, and the satisfying crunch of a headshot.