Colonel Alejandro Vargas is a character featured in Call of Duty: Modern Warfare II. The leader of Los Vaqueros and allied member of elite counter-terrorism unit Task Force 141, Vargas is a Tier One Mexican Special Forces Operator.

The Los Vaqueros is an elite unit of the Mexican Special Forces, led by Colonel Alejandro Vargas alongside with his second-in-command, Major Rodolfo Parra. All soldiers of the unit are handpicked for their loyalty to the country and their skills.