How do you unlock bullet proof patriot car on gta Chinatown wars for DS?

To unlock the Bulletproof Patriot in GTA: Chinatown Wars for the DS, you need to complete the game's storyline missions until you reach a specific point. After progressing enough in the game, you will receive a call from a character named "Mister Black," who will offer you the vehicle. Once you receive the call, the Bulletproof Patriot will be available at the "garage" location on the map.