Xiao is a Chinese PLA operative in Call of Duty: Strike Team. He assists the J-SOC in recovering the stolen data in the rooftop slums in Hong Kong and is briefly playable in the Kowloon campaign.
After Marshall and Reed rescue Chavez and Miles, Xiao appears in a Chinese VTOL and offers overwatch and sniper support for Team Onslaught. He uses his XPR-50 and his QBB LSW to clear snipers and sentry guns on the rooftops of the Hong Kong slums. The VTOL orbits the rooftops and clears the way for the J-SOC, until an RPG strikes an engine, throwing Xiao off into the street and blowing up the VTOL.