Also known as: まりんこゆみ
Webcomic by Anastasia Moreno (writer, translator) and Nogami Takeshi (illustrator). It tells the story of Nipponian schoolgirl Yumi Nagumo, who announces that she wants to become the President of the United States of Amerigo. But in order to do that, she decides to first join the USMC.
The comic is written in Japanese, but there is also an official English translation by the writer herself.
English site: http://www.mcyumi.com/
Japanese site: http://sai-zen-sen.jp/special/4pages-comics/marine-yumi/