This map was originally created for CTF, but it plays very well on Slayer and Oddball as well. I wasn't sure how exactly to set up bomb, but I tested it a bit on neutral bomb and it plays decently.

Map Name: Desolate (Bungie.net : Halo Reach : File Details)
Style: Symmetrical, Competitive
Gametypes: Slayer, CTF. Bomb, Ball

There is no FPS lag.

Updates
v1.2 Changes

Adjusted ramps
Changed heights of a few walls for more access

v1.3 Changes

Adjusted back spiral to be in the middle
Raised the middle of the three walls on the spiral for easier playball
Changed structure of bridge to remove railings, but added cover
Cover is placed so that you can't watch spawns standing behind a wall

v1.4 Changes

Spaced out the bottom middle section of the map(the cover and pillar)
Added alittle cover to the Hologram spawn
Put a block underneath the flag to provide cover inside the base, and it acts as a jump across to the Hologram spawn.
Put a column on the Hologram side of the wall to give the ability to jump from side to side
Changed the double walls outside each base to single, to make the map less crowded
Added a small step-up to each side of top-mid

v2 Changes

Added shelves to each side of the two bases
Changed the general appearance of some things for better viewing/ect
Changed the coloring of objects to match each base

Weapons & Timers

DMR x8 (10s)
Needle Rifle x4 (60s)
Shotgun x1 (90s)
Frags x8 (30s)
Plasma Grenades x4 (30s)

Armor Abilities

Hologram x2

Gadgets

Health Pack x4

Screenshots (Updated for v1.4 *Some don't show the double wall change to single wall, sorry*

Overview:
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Oddball and Bomb View of Base:
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CTF and Slayer View of Base:
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Oddball Play-ball(Only two play-ball positions, one on each side):
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Hologram spawn(One on each base):
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Shotgun(Only power weapon spawn. In the middle of top mid):
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One last top-side view of bases:
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Thanks to all testers.
Map created by Stormeh GoSu, Look GoSu, and PhoBia eM.