I noticed a pattern with Halo 2's Campaign: Opening cutscene 1st pair: Armory (short), Cairo Station (medium/long). 2nd pair: Outskirts (long), Metropolis (short). 3rd pair: The Arbiter (short/medium), Oracle (long). 4th pair: Delta Halo (medium), Regret (medium). 5th pair: Sacred Icon (medium), Quarantine Zone (long). 6th/7th pair (alternating): Gravemind (long), Uprising (short), High Charity (medium), Great Journey (medium). Isn't that a bit odd that every 2 missions are pretty much one continuous mission?