What you describe is not ad hominem attack. Ad hominem is attacking by name calling, trashing the person rather than the argument - sound familiar?
“trashing the person rather than the argument”
What argument?! He’s making unsubstantiated claims which impugn and discredit US operations!
Making baseless, unsubstantiated and inflammatory claims without citation or proof is trashing the truth. It belies a contemptible and underhanded character which is worthy of ridicule.
And how exactly is it supposed to be shown that no US forces were involved or harmed? Someone supposed to post a roll call? And what if they were, is that your argument? “See US soldiers were killed” ‘I-told-you-so’. Who TF posits an “argument” dependent upon US casualties?
Have you ever considered the messenger is criticized due to the crappy, sleazy, false and defaming message he’s pushing?
And you’re going to hide behind the ‘good character’ of someone who make such claims?