Sir, Yes Sir!/Walkthrough
The following is a walkthrough for the mission Sir, Yes Sir! in Grand Theft Auto: Vice City.
Getting the Tank
The Rhino that Juan Cortez wants is in Vice City Mainland. The Rhino is guarded by several well-armed soldiers with Patriots and Barracks OLs around the Rhino. Provoking the soldiers will make all of them attack you with their M4s and vehicles. If the Rhino reaches a warehouse in Viceport, the mission will be failed. There are three distinct ways to acquire the Rhino.
Kill, Block, or Wait
A risky way is to kill all the soldiers guarding the Rhino. This will make the driver leave the Rhino in panic.
Another way is to block their path with a car. This will make the convoy stop and one of the soldier will exit his car to remove yours. At this time the Rhino becomes unlocked.
A safe way is to wait for them at a doughnut shop in Little Havana, across the street from the Little Havana police headquarters. The convoy will stop and the driver of the Rhino will exit to grab a doughnut. The Rhino is unlocked and ready to be stolen.
Delta India Echo
A security protocol activates once you enter the Rhino. The Rhino is primed to self-destruct. Drive the Rhino to Cortez's garage in Little Havana to complete the mission.