Bulletin Board

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 propaganda within the UNSC.

There is a note reading:

For Sale: Pentium XI 33 GF Chicago Office Colony Ship *3 Speed Manual *Transmission Hyde Park Condo Integrity

This is a reference to the Bungie being bought by Microsoft. It mentions the location of Bungie's old office, as well as referencing Marathon.

There are other things too. Some you can read, others you cannot. Also you can see the words "Marines Keep it Clean" and "Scooters are for Squrits".