In the Level "Dome of Light", you request a Rhino when Professer Anders tells you that you can from the landing pad to the right of your base. In the Level "Scarab", you start with two rhinos.
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Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
Over XBOX Live, there can be at the most four people playing one campaign session. On a single XBOX 360, only two people can play at the maximum.
Actually, Halo Reach will allow 4 players to play through the campaign, split screen or through Xbox Live. It's perfectly possible to play with only two or three players as well. As a side note, you can play split screen with your buddy and play with two others on Xbox Live, provided both of you have a Gold Membership.
You can play only two different Species. The Humans, and the Covenant. The Flood and Rebels an only be played by A.I.
They are two of Jun's helmet. One is for your avatar and the other is for your Spartan on Halo: Reach. The one for your avatar is simply got for "Killed 100 enemies in a row without dying in either Campaign or Firefight. The one for your spartan I'm not sure about.