[[DOG]irinel1996]

As milanosie said, it's impossible to shot at least one rocket.
You can do this:

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys & KEY_FIRE) {
        if(!IsPlayerInAnyVehicle(playerid)) return 1;
        if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 432 || GetVehicleModel(GetPlayerVehicleID(playerid)) == 520 || GetVehicleModel(GetPlayerVehicleID(playerid)) == 425) { //Rhino, Hydra, Hunter
            SetPlayerHealth(playerid, 0.0);
            SendClientMessage(playerid,-1,"In this server isn't allowed deathmach.");
        }
    }
    return 1;
}

Best regards!