Frost participated in Operation Kingfish alongside Sandman, John Price, John "Soap" MacTavish, Simon "Ghost" Riley and Gary "Roach" Sanderson. He provided sniper support for Bravo Six before aiding them in trying to find Makarov inside the safehouse. After Makarov was not located, the team was extracted by helicopter, except for Price, who sacrificed his freedom by staying behind, fighting the Russians long enough for the others to escape until he was captured and sent to a gulag
Frost participated in the Battle of New York during the events of "Black Tuesday" and "Hunter Killer". His team, Team Metal, was assigned to destroy a Russian electronics jammer on the roof of the Stock Exchange. Facing heavy resistance, Frost and his team managed to disable the jammer, evacuating aboard a Black Hawk helicopter. They were then pursued by a group of Mi-24 Hind gunships in the skies above New York, which Frost destroyed using a minigun
Team Metal was then grouped with a squad of Navy SEALs to take control of a Russian Submarine (acting as a command vessel). Frost and Sandman sneak aboard the sub after an underwater insertion through the Brooklyn Battery Tunnel and re-program the missiles on board to launch onto the Russian fleet, effectively crippling Russia's seaworthiness and forcing them to retreat as Frost and Sandman make their escape via Zodiac