Juan Cortez

Cortez has lined up a buyer for serious military hardware. Tommy infiltrates the Fort Baxter army base, hijacks a Rhino tank, and drives it back to Cortez's yacht.
Sir, Yes, Sir! is a mission in given to protagonist Tommy Vercetti by retired army colonel Juan Cortez from his yacht docked in the Ocean Bay Marina in Ocean Beach, Vice City.
Cortez has a buyer who wants a "piece of military hardware", a tank. He wants Tommy to steal it and drive it to a lock-up in Little Havana.
The target vehicle is being escorted southbound down the Vice City Mainland highway. The Rhino is guarded by several armed soldiers carrying Ruger assault rifles driving Patriots and Barracks OLs, as well as marching on foot on either side. The Rhino's destination is the Viceport Military Warehouse, and Tommy will fail the mission if the soldiers reach this point.
Attacking or otherwise provoking the soldiers will alert the convoy and turn them hostile. Killing all the soldiers, sniping the turret gunner undetected or setting the tank on fire with a flamethrower or molotov cocktail will make the Rhino driver exit the tank. Shooting one of the tank's occupants in the head will unlock it. Creating a roadblock with a vehicle will cause the convoy to stop while the Rhino's driver exits to move the obstacle (or another driver, depending on where the vehicle is parked). The convoy also stops for a short period at Calleggi Delicatessen Restaurant on the edge of Little Havana. The driver will exit the tank and enter the restaurant for doughnuts, during which time the Rhino is left unlocked.
Once the player enters the Rhino, a three-star wanted level is given and security protocol "Delta-India-Echo" will activate, starting a self-destruct timer of approximately three minutes. If Tommy fails to make it to Cortez's garage in time, the tank will explode, wasting Tommy and failing the mission.