u cant
You can't get it down without modding the game.
On halo 3, the 'Forward Unto Dawn' frigate
Check out this video to see how to get the frigate down in Halo 3: https://www.youtube.com/watch?v=ug8dHeeUPAk
Either out of many blocks put together made to look like a frigate(on forge) or use a mod to insert a frigate (I never have so I wouldn't know how that works).
U Cant
I would rather get an Xbox 360 and Play halo 3 because halo 3 is the best game in the world. Halo 3 is better than halo 2 but halo 1 is the bomb but halo 3 is still alsome.
Step1. blow the door between passenger compartment and pilot 2. plant stickys all over the butt of it 3. blow it up 4. FLY!
He survives because he is in the front part of the Frigate and makes through the portal, while Cheif is in the back and so when the portal closes Arbiter makes it back to Earth and Cheif doesn't.
halo 3 obviously
Halo 3: ODST is the newest of the two, but not the newest Halo game.
Sgt Johnson died in HALO 3(last level) by the monitors laser after he tried to activateHALO (they activated the broken HALO from HALO 1 so they can destroy the Ark-activates all the HALO's). Masterchief got lasered twice short and Arbiter got lasered once long. Eventually Masterchief killed the monitor and activated HALO. He left Sgt Johnson to die because Sgt Johnson wanted to. Masterchief and Arbiter escaped in a Warthog and Drove to the Frigate.
The halo time line goes Halo Wars, Halo: Reach, Halo:CE (halo 1), Halo 2, Halo: ODST, Halo 3. Halo 3 and ODST are practically at the same time.