Teammate destroying heli at match start

Hi! I've been in several matches where a team member instantly fires RPG rocket at the Apache/attack helicopter when the game starts. This is very annoying and puts the entire team at a disadvantage from the get-go. A short immunity timer on vehicles (just enough for teammates to enter it, like 15 seconds) only at match start inside the spawn area could fix this. Enemies should still be able to destroy it with no time limit. Like an anti-griefing mechanism of some sort.