While playing CEA, I came up with a concept for a new Halo survival mode: Containment Protocol. While I realize this would be unable to be in Halo 4, seeing as how it is nearly finished being developed, this would be a great addition to future Halo games. It is rather simple:
You start the match with either a Magnum or Forerunner pistol, depending on which map you choose. (To be explained later) The game has a round system, and doors and other features will be unlocked the further you progress. You will have a Point/cR system. You get Points and cR with every kill. You can open doors, request weapon/vehicle drops, or receive assistance. Round 1 will include Infection Forms and perhaps a Combat Form or two, while Rounds like 30 and higher will have Tank Forms and Juggernauts. A Gold Skull will be turned on every 5 Rounds, and once all skulls are on, their effects will begin to be upgraded. Your Multiplayer rank will intertwine with Protocol, so the higher you are in Multiplayer, the more weapons, vehicles, and power ups/Armor Abillities you will be able to airdrop in.
The idea is for there to be four maps as a default, with DLC to add more. Two Forerunner maps, and two human maps. Forerunner maps will be focused more on the Forerunner arsenal, while the human maps will focus more on the UNSC’s arsenal. Human weapons will be dropped in via SOEIVS, (Or whatever they’re called.) and vehicles will be dropped in via Pelican or Albatross. Forerunners get their weapons dropped in using light projection and vehicles via dropship. You will use your Forerunner and Spartan from the Armory when playing Protocol. Your Firefight voice will also apply to this.
UNSC Map Weapons and Vehicles:
Any other UNSC weapons
Scorpion (Depends on Map)
Hornet (Depends on Map)
Falcon (Depends on Map)
Mongoose (Depends on Map)
Warthog (Depends on Map)
Gausshog (Depends on Map)
Rockethog (Depends on Map)
Pelican (Depends on Map)
Transport Hornet (Depends on Map)
Grenade Launcher Falcon (Depends on Map)