"Grand Theft Auto IV" doesn't actually include a tank, but the reference is to the NOOSE APC -- or armored personnel carrier -- which appears in the "Ballad of Gay Tony" expansion, as a tank. You can take to the streets of Liberty City in this combat vehicle in either the single player or multiplayer game.
Finding the APC in Single Player
APCs turn up in several places in "The Ballad of Gay Tony." The player will be asked to steal one in the mission "Caught With Your Pants Down." After the main storyline is over, the player can get one from Henrique Bardas. Another APC appears in the mission "Frosting On the Cake," although the goal is to destroy it. Another APC will appear at Yusuf's construction site, but only after the mission "For the Man Who Has Everything" is over and the player has shot 50 seagulls.
Using the APC Cheat
To spawn an APC, simply dial 272-555-8265 on Luis' cell phone. These numbers spell out APC-555-TANK. The APC will pop into existence near Luis. If the APC is destroyed, just dial for another.
The APC in Multiplayer
In the multiplayer game, it isn't possible to spawn an APC using the phone. Instead, players in Free Mode can find an APC located in a garage underneath the East Holland police station. This is in Algonquin, near the northern end of the island. It's always there in Free Mode, but although there are rare APC-specific race missions, the vehicle can't be obtained in most competitive modes.
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