Kilroy was here easter egg

This is my first playthrough of borderlands 2 and during the mission Where Angels Fear To Tread I noticed that claptraps graffiti is a nod to the WW2 tradition that American soldiers had.

I searched up to see if there was any mention of this and couldn’t find any and although with a game this old, I’m near enough sure that this has been discovered at some other point but I thought I’d post it anyway.