They only appear in Survival Mode, on Tier 3 and 4 maps on later waves and in Tier 1 and 2 around wave 20. It would make sense that they appear sooner for Tier 3 and 4 maps, though that is unverified. They have been seen sprinting around the map but usually try to plant a claymore first somewhere around the map. When they assault the player, they are usually reckless. Unlike other enemies, they have the ability to plant Claymores but do not appear to be able to throw grenades, and are armed with a PM-9. The Claymores can be seen by the player(s), and do relatively little damage, where one claymore will only stun the player, but should the player hit another one soon after, they will likely to be downed. They grant the player $150 upon death. Enemy Claymores are sometimes placed in plain sight of the player, in spots that a claymore would be very much impractical.
Enemy Claymores use the same model as the player's Claymores, are usually set down by armories and nearby the player's location, and have a particularly large range compared to their multiplayer counterparts.
Unlike in multiplayer, in Survival Mode there is no way to distinguish between claymores planted by the player and those planted by the enemy (other than memorization).
Unlike the Claymores the player can plant, the Claymore Experts Claymores have a 360 degree blast radius, but there is significantly less damage dealt from behind the claymore than from the front.
Claymore Experts have an unlimited amount of claymores, although they only plant them when they aren't under fire.
The Claymores the Experts plant can be destroyed by grenades or gunfire, just like in multiplayer, but they cannot be disabled for periods of time by flashbangs, unlike multiplayer.
Claymore experts are unique amongst the Call of Duty characters hostile to the player, as they are the only ones who plant mines that are available to a player (Claymores), as players do not have access to the chemical mines the Chemical Agents plant.
Claymore experts hold the PM-9 two handed, rather than one handed like in first person view if a player takes said weapon from one of them.