Because, well, because they had space to fill, I guess, most of DC's war comics of July 1973 ran this full-page feature (click to embiggen to full readable war-size):
Now, the piece didn't purport to be a complete listing of Robert Kanigher's creations--it expressly says at the end that "these are only a few of Bob Kanigher's creations."
But apparently, someone complained about how incomplete that list was. Did readers write in? Or, for all I know, Kanigher himself kvetched. Anyway, just 3 months later, this "addendum" graced several of the war book's letter pages (this one was from G.I. War Tales #4 (1973)):
So take a minute, and go read a Bob Kanigher comic today...