APC - neither are WMD. Napalm was described as a terror weapon, Agent Orange although horrendous was not deployed as a chemical or biological weapon.

I can remember this being discussed previously on the forum. The discussion was quite detailed and extensive as most things are here.

Again if memory serves me correctly the upshot of it was that the stuff was deployed purely with the intention to defoliate jungle, not to kill people and at the time no-one knew what the side and long term effects would be. As soon as they were known its use was abandoned.