I believe that Mike has known Eric for years and they’ve probably worked together (I don’t remember details.)
I found this biography: “E.O. Costello is a New York-based attorney, whose love of history has led him to study, in depth, the cartoons of the 1940s and the historical and pop-culture references contained in them. He has written for Animato!, APAtoons, and was the creator of The Warner Bros. Cartoon Companion.”
Eric, often credited as “E.O. Costello” has certainly written stories with anthropomorphic characters, as Mike also has.
He definitely had a mustache. His nose had a similar shape to Tracy’s and they both have thick necks, but he doesn’t have any other resemblance to Tracy. It’s always hard (for me, at least) to make characters not resemble each other.
I’m sticking with “unnamed officer.” You can do as you see fit.