Grillo's early history is never given, however, Colonel Hargrove has stated that he knew Grillo for years while briefing Mike Powell on how he was captured. Grillo was sent to sabotage some artillery in Arsew, North Africa, then "light the torch" signaling the invasion. Unfortunately, he was found by the Germans in the area and his documents and explosives were confiscated.
Lighting the Torch
A team lead by Captain Richards was sent to rescue him. However, after a firefight, only one survived, 1st Lt. Mike Powell, who nevertheless managed to rescue Grillo on his own. Grillo then stole an MP40 to help fight against the Germans, then he took charge and helped guide Powell through the searchlights that were on a German fort. They gathered up the explosives and documents then rescued another prisoner (who may or may not die during the mission). Afterwards, Powell and Grillo destroy a pair of artillery batteries with the newly acquired explosives. While Powell left to sabotage a German motor pool, Grillo stayed behind to get a transport.
He arrives in a jeep moments after Powell managed to sabotage the motor pool to pick him up. He later drives Powell, manning the jeep's machine guns, over to a lighthouse doubling as a radar tracking station built into a cliff, meeting resistance along the way. On the way, Grillo drives them into an airfield where they destroy many of the planes and fuel dumps. Afterwards, Grillo and Powell split up again, this time, Grillo draws out the German reinforcements while Powell goes through a bunker to the lighthouse. After Powell succeeded in "lighting the torch", Grillo picks him up under heavy fire.
Later, Grillo personally requested Powell's assistance on a mission to destroy the Naxos detector and scuttle the experimental U-529 submarine in Trondheim, Norway. Disguised himself as German officer, Grillo managed to provide Powell the entrance to the base. However, the mission quickly sours, and Grillo is killed, telling Powell to go on without him. Grillo's sacrifice enables Powell to complete the mission and lead the following war efforts for Allies.
Grillo has short, brown hair along with noticeable facial stubble. His outfit in Operation Torch is rather casual for a military officer, consisting of a brown jacket over a brown-green sweatshirt, along with light brown pants and brown shoes.
- Jack Grillo's appearance is also used for the "Allied SAS" player skin on multiplayer.
- He is named after a Medal of Honor crew member of exactly the same name, Jack Grillo, the lead sound designer of Medal of Honor: Allied Assault.
- His head model would be reused by the Italian soldiers and Terry Lyndon in the Breakthrough expansion pack.