"Welcome to the party gentlemen. If you’re not tired of shooting these bastards, we’ve got a bigger gun to use."
— Mercer, after Franks assists him

Captain Mercer is a US National Guard who appears in Call of Duty: Modern Warfare 3: Defiance.


Playing only a small part, Mercer and Sgt. Benson appear pinned down by Russian forces at a water treatment facility. Sgt. Franks and his team breach the facility and eliminate the Russians. Mercer then informs them a convoy of Russian armours and transports are on their way to Hoover Dam and their orders are to eliminate them.



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