Re: Just for the record ...
The Iraqi chemical weapons program was native. Organophosphates and mustard gas really aren't that hard to make. As I remember it from the UN reports a lot of the kit was actually German, but as you're basically making insecticide it's all dual-use stuff. And Iraq was only under weapons sales sanctions in the 1980s.
As it happens Iraq's sarin production was pretty poor anyway, so they had to rely on mustard a lot more, as that's even easier to make and store. A lot of the chemicals the UN destroyed in the 90s was contaminated, and they struggled to get munitions to deliver it well. Unfortunately for the Iranians, they had a tendency to send their troops into combat badly trained, and even more badly equipped. So they still suffered mass casualties.
As it happens, the US didn't sell much military equipment to Iraq at all. They bought that from The Soviet Union, China and France. That's why they used Russian artillery, Russian tanks, Russian and Chinese personal weapons, Russian helicopters, Russian missiles, Russian radars and a mix of French and Russian combat aircraft. Apparently Britain sold them non-lethal military kit, as for example I believe we sold them all our desert camouflage clothing, on the assumption the British army wouldn't be fighting outside Europe very much. Oops.