SECURITY-class Mjolnir

SECURITY-class Mjolnir, also designated as the MJOLNIR Powered Assault Armor/M variant, is a MJOLNIR armor variant adapted from an infiltration prevention suit designed by Misriah Armory.

Development history
The Security variant was first manufactured in the Misriah Armory facility on Mars in 2528. After Mark V was released, this armor was adapted to its use. Like most MJOLNIR variants, the later model of the Security helmet had been upgraded to be compatible with all MJOLNIR Mark VI variants.

After the first wave of GEN2 systems, based on requests of veteran Spartan-II and Spartan-III operatives, the UNSC Ordnance Commission considered reassessing a refined and upgraded version of the EVA-class Mjolnir suit. This led to the creation of the WRATH-class Mjolnir where its right shoulder pad is based off the Mark V Security shoulders.

Specifications
The GEN2 variants helmet has two watchdog AIs hovering at the edges of the SECURITY VISR interface, alert for cyberintrusion attempts and sensor anomalies that could indicate subversion of connected surveillance networks. The armor also seamlessly integrates with Navy networks and security constructs.

Development history
The GEN2-era Security set was built to Spartan branch requirements for ship and station defense personnel.

GEN2 compatibility
SECURITY [GEN1] helmets continued to be used by Misriah Armory's executive protection teams after the Covenant War. These helmets have been upgraded to be compatible with GEN2 systems, though corporate representatives balk at releasing its custom VISR.

Helmet
Unlock: Get a total of approximately 1000 gamerscore in Halo 3.
 * Helmet Description: The Mjolnir(m) variant was manufactured at the Misrah Armories Facility on Mars in 2528. It has been upgraded and modified to be compatible with all current-issue armor variants.
 * The helmet's most noticeable feature is the larger, more prominent "figure-eight" shaped visor which looks almost bug-eyed. It bears resemblance to that of a modern day fighter jet pilot helmet. This helmet is inspired by the protagonist of Marathon, although the mouth is covered. The helmet is large with a small raised section on the forehead in the form of the Marathon logo. Wearing the helmet will also add a small antenna and dial to the right shoulder.
 * The prominent bug-eyed shape has been toned up, and the helmet looks bigger overall.

Shoulder pauldron
Unlock: Officially, the Security shoulders unlock when the player has attained at least 750 Gamerscore points from Halo 3. However, the shoulders are renowned and well-known bugged items.
 * Shoulders description: The Mjolnir Mark V(m) Powered Assault Armor was originally manufactured in 2528 and recently upgraded to be compatible with all current-issue armor variants.
 * The shoulder pieces are quite largely rounded, with a section with an upper center, trapezium-shaped arm guard going out the bottom and a rounded section above that. It should be noted that this shoulder permutation is prone to a glitch that may cause you to not unlock them until you have 1000 gamerscore; however, another glitch has occurred that unlocks the Security shoulders before reaching 750 gamerscore points in Halo 3.
 * The shoulders are less rounded than the Mark V.

Chest
The Security armor does not have a chest plate, although wearing the helmet will give the player a distinct "antenna and dial" on the right side of the back plate. This may be a reference to the antenna Master Chief had in the pre-Halo: Combat Evolved at the Mac World Trailer. For the updated Halo 3 customisation menu available in Halo: The Master Chief Collection, this antenna has been separated from the helmet as a separate chest item, allowing it to be used with any other helmet. The Security chest plate otherwise resembles a standard Mark VI chest.

MCC

 * Description: The first SECURITY variant was manufactured in 2528.

Helmet
The MJOLNIR(M) variant helmet was manufactured at the Misriah Armories facility on Mars in 2528. Base price: 250,000 cR at General rank. In Halo: The Master Chief Collection, the helmetcan be unlocked through Season 1: Noble's progression system at Tier 90 for.
 * Description: All (M) variant helmets have been upgraded to be compatible with all current issue armor.

UA/HUL price: 200,000 cR at General rank. In Halo: The Master Chief Collection, the attachment can be unlocked through Season 1: Noble's progression system at Tier 96 for. CBRN/CNM price: 200,000 cR at Legend rank. In Halo: The Master Chief Collection, the attachment can be unlocked through Season 1: Noble's progression system at Tier 99 for.
 * Description: Up-armored varient with hardened uplink module for MILINT acquisition.
 * Description: For operations in hazard zones; command network module.

Shoulder
Unlock: 70,000 cR for left shoulder; 275,000 cR for right shoulder, rank of General needed for both. In Halo: The Master Chief Collection, both shoulders can be unlocked through Season 1: Noble's progression system at Tier 83 for.
 * Description: The Supplemental Armor, Pauldron, MJOLNIR(M) variant was originally manufactured in 2528.

The right shoulder is equipped with a Kukri.

GEN2
Unlock: Rare REQ card
 * Helmet Description: Two watchdog AIs hover at the edges of the SECURITY VISR interface, alert for cyberintrusion attempts and sensor anomalies that could indicate subversion of connected surveillance networks.
 * Armor Description: Built to Spartan branch requirements for ship and station defense personnel, SECURITY armor seamlessly integrates with Navy networks and security constructs.
 * Available skins: Oppressor and Watchdog
 * Oppressor Unlock: Ultra Rare REQ card
 * Watchdog Unlock: Ultra Rare REQ card

GEN1
Unlock: Rare REQ card
 * Helmet description: SECURITY [GEN1] helmets continued to be used by Misriah Armory's executive protection teams after the Covenant War. These helmets have been upgraded to be compatible with GEN2 systems, though corporate representatives balk at releasing its custom VISR.

Trivia

 * The SECURITY-class helmet (as well as the Mark VI version's pauldrons) is based on that worn by the protagonist of the Marathon series, who is known only as the "Security Officer". The Marathon logo is featured prominently on the Mark VI version of the helmet (just above the visor) in Halo 3. The Mark V Security helmet in Halo: Reach and Halo 5: Guardians lacks the symbol, likely due to intellectual property concerns (as Bungie retained the Marathon IP after leaving Microsoft). However, the Reclaimer symbol (a modified version of the Marathon logo) appears on the GEN2 version of the helmet in Halo 5: Guardians.
 * The Halo Encyclopedia erroneously states the Security armor was manufactured in 2543 rather than 2528.
 * During the development of Halo 5: Guardians, the GEN2 Security armor was designated "A067" when it was conceived.

List of appearances

 * Halo 3
 * Halo: Blood Line
 * Halo: Reach
 * Halo 5: Guardians
 * Halo Mythos
 * Halo: Outpost Discovery