I didn't find it offensive, per se, I just didn't find it convincing. All I could think is, "that veteran would kick Greg's ass for trying to pull that stunt." :)
Oh well.
One thing though, it would have been a lot less offensive if Sept 11 hadn't been the day it was... and I suspect Illiad (like Jeff Darlington and almost everyone else in the webcomics world but me) does all of his strips well in advance...