Vengeance, you may run this script server side (this is a mando missile question, not mando bombs):
if (isServer) then
{
[]spawn
{
{
if (typeOf _x == "ZSU") then
{
_mando_setup = (_x getVariable "mando_setup");
if (isNil "_mando_setup") then
{
// one of every three existing shilkas will be a SAM
if ((random 100) > 33) then
{
Sleep 1;
_disp = _x;
_posunit = 1;
_ttype = ["Air"];
_quantity = 12;
_minrange = 500;
_maxrange = 3000;
_rof = 6;
_pos = [0,-1,0, 2];
_scan = 360;
_mink = 0;
_enemies = [west,sideEnemy];
_antimissile = false;
_fixed_firing_direction = false;
_initially_active = true;
[_disp, _posunit, _ttype, _quantity, _minrange, _maxrange, _rof, _pos, _scan, _mink, _enemies, _antimissile, _fixed_firing_direction, _initially_active, true]exec"mando_missiles\units\attackers\mando_hawk.sqs";
_x setVariable["mando_setup", 1];
}
else
{
_x setVariable["mando_setup", 0];
};
};
};
} forEach vehicles;
Sleep 15;
};
};
In this case, a spawned ZSU has 33% chances to be a sam launcher. You may increase the % at will.