Words using the prefix "under" do not take a hyphen! What is "under-armed, and under-trained"? That's "underarmed, and undertrained".
What is "under-armed, and under-trained" in this article ("Russian convicts recruited to fight in Ukraine were warned they'd be shot if they deserted. One who did was returned to Russia — and was killed with a sledgehammer instead.")? Will your writers please get it through their heads that there is NEVER a hyphen with the prefix "under—" (nor with "over—", come to that).
Christopher Moss shared this idea