It doesn't even make sense, since CW are much more effective against the general population than troops. ie: It is much easier for troops to deploy countermeasures that negate or reduce the effectiveness of a CW attack. OTOH, in unlucky environmental conditions, a CW attack can wind up harming the rebel attackers and surrounding innocents as well, while the troops sit in their anti-CW gear and wait it out. Arming rebels with CW is just about the dumbest, least effective, most dangerous way to use CW; and ought to be a war crime in its own right.