First appearance: Chapter 1, into the studio. (mission after the prologue)
Final appearance: Chapter 40, To hell and back. (final level)
how dangerous? Not so much. easy to kill. great source of ammo. on realism they can be really tough. but overall. there not much of a threat when it comes to combat. but because their humans, they can hear suppressed guns like the MP5SD. Stealth isn't easy when it comes to these guys. so, remember to stay either Crouched or Crawling when your sneaking past or up on a Red Kobra Grunt!