On a Pearl Harbor propaganda poster, what does "C-H" mean?

In my US History II class we are learning about the bombing of pearl harbor and the propaganda that came out afterwards. On a poster reading, "They shall not have died in vain" at the top and other motivational sayings, at the bottom there is a phrase, "Come on. C-H... do more! This isn't peace... show more In my US History II class we are learning about the bombing of pearl harbor and the propaganda that came out afterwards. On a poster reading, "They shall not have died in vain" at the top and other motivational sayings, at the bottom there is a phrase, "Come on. C-H... do more! This isn't peace - it's war!!" I was wondering what the "C-H" in the saying meant. I could only come up with possibly "citizens at home" but I don't have any resources to back it up. I would appreciate anyone's knowledge or input :)

Here's a link to the poster:
http://www.ourdocuments.gov/doc_large_image.php?doc=108
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