Cat Gets Honorary Coast Guard Title

Herman, a character in Baltimore, undergoes fingerprinting to obtain a Coast Guard pass. He faces an issue with his birth certificate, which is eventually resolved. Herman is then rated as an expert Mauser and embarks on his first duty tour, proud of his role in controlling rats.

What is the significance of the phrase 'ambassador of ill will to rats' in the context of Herman's story?

Describe Herman's feelings as he starts his first tour of duty.