>The rail guns
But artillery development didn't end there. Saddam Hussein commissioned a cannon that might have sent payloads into orbit. Or big ass shells on Israel. Gerald Bull was ultimately murdered and the parts for his big gun confiscated. There are stories of the allies testing the smaller versions of the gun after the defeat of Iraq.
https://www.smithsonianmag.com/smart-news/bizarre-story-saddam-husseins-failed-supergun-180962820/