|Appears in||Medal of Honor: Rising Sun|
|Affiliations||United States Marine Corps|
|Weapon||Browning Automatic Rifle|
|Voice Actor||Christoper Gorham|
Thomason along with Brooks aids Griffin in his mission to find and destroy the Pistol Pete cannons. On their mission they came across Martin Clemens and a squad of guerrillas.Together they raid a POW camp and rescues Edmund Harrison and two other prisoners. He stays behind with Martin Clemens and the POWs after Edmund Harrison and Joseph Griffin move to destroy the gun. He is never seen after that.
- It is possible to push Thomason all the way through the rest of the mission, although he will almost always be killed at some point