RECON-class Mjolnir

The Recon Armor is a type of United Nations Space Command body armor.

Introduction
The Recon Armor is a variant of the standard Mark VI MJOLNIR powered battle armor. It is an armor permutation in Halo 3 multiplayer. Bungie has confirmed all of the armor permutations have no effect on gameplay.

Helmet Characteristics
The Helmet features largely rounded features with a rise along the top of the head with two black triangles pointing out the front of the head on each side of the rise. It has a thin visor and a area of black alloy beneath it, surrounded by armor. The helmet is largely angular with a pair of what look like breathers on each side of the mouth and a small indent on the forehead.

Shoulder Characteristics
The shoulder pads are a more angular version of the EVA, with a box like shoulder pad and a section jutting out and down the arm. It also features a slanted rectangular strip of metal jutting outwards at a 90 degree angle from the shoulder pad.

Chest Characteristics
The Chest piece is similar to the Mark VI but instead of being made up of smooth plates reflecting the human body it is more angular like the other parts of the armor and reflects it with a few small changes.

Unlock
Note: Some have said that getting all Meta-Game achievements will unlock the armor, however, most, if not all, people who have done so do not have the armor. Many other people have stated that beating the game on Legendary in reverse, with at least 3 skulls on will unlock the armor. This however is most likely false, and completely unconfirmed.
 * Head: Currently Unknown. Suspected to be given only to Bungie Employees.
 * Shoulders: Currently Unknown. Suspected to be given only to Bungie Employees.
 * Body: Currently Unknown. Suspected to be given only to Bungie Employees.

Luke Smith has recently posted some cryptic hints as to how to get the armor on the Bungie.net forum:

"The trigger isn't something you can control. It's not your finger that pulls it"

"There's a gun with a trigger, but there's nothing your hand can do to fire it. "

One plausible theory based on these quotes is that to earn this armor, something needs to happen that is out of your control, that you can't influence. Possibly connected to the automated turrets found in the campaign.

At this time, until further information is released, the consensus points to Bungie being the only key to unlocking this armor, and that they alone grant access to it(this is also supported by Luke Smith's quoted "clues").

Trivia

 * The armor permutation was first discovered in the Bungie update on the 7th of July then later with videos from PAX ’07 and leaked images.
 * The game guide makes no mention of the Recon armor, however, it is noted that Bungie requested that some of the armor permutations not be in the guide.