These are public domain sounds, downloaded from
http://www.partnersinrhyme.com/pir/PIRsfx.shtml

Grenade2.wav and Pink_Noise1.wav were produced from the corresponding .au files
with

  mplayer Grenade2.au -ao pcm:file=Grenade2.wav
  mplayer Pink_Noise1.au -ao pcm:file=Pink_Noise1.wav
