Sarge, and if you looked at where they came from originally you will find the Made in USA stickers on them, or at least on a lot of the parts, and the plant. Saddam was the proud owner of presses that could forge US currency flawlessly, as he bought the presses, the inks and the paper from the US treasury, and had everything from the USA, including the numbering dies, just needing the copied plates to do the work. Bought to make Dinars.
South Africa also supplied some serious firepower to them, and the US military was pretty worried about the artillery that they had, seeing as it was developed in SA and both would pound them from far away, out of their range, and still hit with better accuracy at extreme range. Those 155m shells were supplied in some quantity, but the US has not as yet found all of them, orall the G6 and G5 launchers. There is also is a lot of small arms and such that just "disappeared" and still is missing. There is a lot of desert to hide stuff there, though a lot did move over borders. Then there is the stuff that was designed and built in house as well.
We joked that the only places the US invaded was for the oil and minerals. If they discover oil you get worried.