Wallcroft

"Wallcroft, Griffen, cover our six."

Wallcroft was a SAS soldier who served alongside Soap during the events of Call of Duty 4: Modern Warfare. He is seen in the mission Crew Expendable guarding the ship deck along with Griffen. He maintains the rank of Sergeant.

Trivia

 * On the level "Crew Expendable", Wallcroft, Griffen, and the final SAS troop are non-killable. If he spawns in other levels, such as Ultimatum or No Fighting In The War Room, he will be vulnerable like others.
 * Also on "Crew Expendable", there are sometimes (rarely) two SAS men both named Wallcroft. One appears as a Sergeant, while the other is a Private.
 * His appearance is randomly generated.
 * Pvt. Wallcroft can randomly spawn on any SAS level, including Ultimatum and in the end of "One Shot, One Kill".
 * At the start of "Crew Expendable", when you're on the helicopter, you'll see Wallcroft is not present. You can only see John Price, Gaz, Griffen (a randomly generated SAS soldier), and the two pilots.