Now CJ can call for help one of his friends (who exactly, you will understand from the screenshot). He will come to the armored personnel carrier and will protect you. It attacks those who attack you and attacks those you attack. He is very accurate and durable, so it is very difficult to get away from his bullets or kill him. And of course, he will ride with you and shoot people objectionable to him from the windows of a car or from a motorcycle.
Controls: Call the guard - while holding "N" press "F".
P.S. This site already has the script "Guard on an armored personnel carrier" from the scripter "norlol". But this is different - my version of this script.