Call of Duty Wiki:Ask A Veteran/Stealth Guide

Stealth is a tactic used in the Call of Duty series that involves using suppressed weapons or silent means of eliminating enemies, in order to take them by surprise, and to avoid being seen or heard.

Commonly known as "ghosting" in multiplayer modes, players who wish to be stealthy use a silenced weapon, or the knife, with perks such as Bomb Squad, Bandolier, Scavenger or Marathon, combined with UAV Jammer / Camouflage / Cold-Blooded and Dead Silence or Ninja Pro. These perks and weapon combinations cause players to remain unheard and unseen on radars that are used by enemies.