Bulletin Board
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Summary
There's a bulletin board found just outside the bridge of the Pillar of Autumn. Some of the messages look plausible, some are just silly, others are easter eggs.
One says: "Missing: Calico Cat: Answers to Jonesy" This is a reference to Aliens, a movie Halo 1 is based off of in many ways.
There is a picture of Earth from the Moon with the caption "Fight for her" on it. This is likely pro da within the UNSC.
There are other things too. I noticed it on my first time through the game. Some you can read, others you cannot. Also you can see the words "Marines Keep it Clean" and "Scooters are for Squrits"
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