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|Appears in||Call of Duty: World at War|
|Rank||Private, later Sergeant|
|Affiliations||United States Marine Corps: Marine Raiders (Carlson's 2nd Marine Raiders Battalion)|
|Status||Alive/K.I.A. (Player determined)|
|Killed By||Japanase Officer with a Katana|
|Death||August 17th, 1942/May 29th, 1945 (Player determined)|
|Weapon||Thompson, M1911 Colt .45, M1 Garand|
|Timeline||World at War Timeline|
- "Relay the message to Major Gordon, The Artillery on the Point has been knocked out."
- — Rooker in "Relentless"
Rooker was the radioman of the Marine Raiders rescue team led by Sgt. Tom Sullivan and Cpl. Roebuck, which made a raid on Makin and saved Pvt. C. Miller. Later during the assault, the squad met a bunch of "dead" Imperial Japanese soldiers in the jungle. Sergeant Sullivan told Rooker to call another squad with his radio, in order to check if they already cleared that area.
When Rooker was going to use his radio, a signal flare rose, blinding everyone. Rooker is then stabbed by a Japanese soldier wielding a katana. However, Pvt. Livingston or Cpl. Lozano sacrifice themselves for Rooker if they have survived up until this point. His weapon in "Semper Fi" is an M1 Thompson.
If kept alive in Semper Fi, he will return in Relentless as a Sergeant as the radioman once again, this time he is invincible for the end of the mission. However, he will use an M1 Garand unlike in Semper Fi.