Actually it doesn't "come with" the napalm strike it's simply the unit called for the napalm attack.
Basically the Napalm Strike Superweapon targets a location, then it calls an OCL and the OCL units are the NapalmStriker Units. They are simply what delivers the weapon, nothing more.
All MiGs can make a firestorm like the Napalm Strike.. Just have 4 of them hit close together (3 second gap at maximum) and it should work fine
~Skywaters