http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=100863693
Any arrogance in UNSC Recruits seldom survives it's first experience in this well-worn training centre.
2-6 players.

Background:
Cornerstone has been in development literally since my first days on Halo 3. Originally a simple box, Cornerstone has been refined through numerous builds, each adding onto the previous version with my evolving understanding of Halo 3 game-play, aesthetics, and forging technique. While at times forgotten as new ideas rose and fell, Cornerstone has ultimately remained a constant (or a cornerstone) of my Xbox 360's map library.

Used by UNSC Instructors to give recruits a dose of reality, TF Cornerstone is a small arena-style installation used to help gauge the initial combat capabilities of UNSC rookies. As these new soldiers progress though the training program, they will often return to the arena to apply their new skills and strategies to the facility.

Cornerstone boasts a fast, yet strategic environment ideal for small parties of 3-4 players. Due to the simple map geometry, players unfamiliar to the map tend to ease in quickly, while that same geometry helps keep the map fresh to more experienced players.

It is with great pride that I now preset this piece to the forgehub community.

Weapon List:
Weapons on Map:
• 2 Assault Rifles.
• 4 Battle Rifles.
• 1 Shotgun.
• 4 SMGs.
• 2 Spikers.
• 2 Plasma Rifles.

Grenades on Map:
• 4 Fragmentation Grenades
• 2 Plasma Grenades
• 2 Spike Grenades

Equipment on Map:
• 1 Power Drain.
• 1 Regenerator.

Recommended Game-types:
• FFA Slayer.
• SWAT.
• Fast CTF.
• Supports All game-types.

Map Shots:

Please note that a fence wall was added above Light and Dark Side after these pictures were taken. It is a minor change, implemented to prevent players from escaping the map.

Overview, looking to Red Base.

Overview 2, looking to Light side.

The Pit (Center).

Lower Pit (Dark side, symmetrical to Light side).

Dark side overview. Note the drop-down to tunnels.

Light side overview. Note drop-down to tunnels.

Looking from Blue/Yellow base to Dark side.

Tunnels (All 4 are symmetrical).

Action Shots:

Prowling the Pit.

Dimensionality.

Sprint.

Were in ur mapz, duin our yogaz.

Stickz.

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Cheers,
Download
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