In Halo 4, Locus is one of four helmet-only armor sets alongside the Deadeye, Scanner, and Strider helmets.

In Halo 5: Guardians due to the 'Body' having a predefined customisation this armor set permanently has the following parts from Halo 4:

Body description: Designed to provide an answer to threats arising during assaults on heavily defended tactical nodes, the grim visage of LOCUS armor is a common sight among Spartan boarding parties and special responses teams.

Helmet description: The LOCUS' passive cyberintrusion package and battlenet cache allows the user to stay aware of the strategic situation while remaining invisible to any hackers in the network.

Helmet description: Exotic and resilient.

Description: Despite its exotic design, most operators select this armor based on its resiliency.

It is also available in the Halo 4 Game of the Year Edition. Unlock: The helmet was a pre-order bonus through .nz or HMV.com.

Most operators choose this suit due to its resiliency. These tests confirmed that Locus was fully able to survive extreme opposition and firepower. Lethbridge also tested the armor for both resiliency and its attention to stealth and anti-security measures outside the megacity of Lethbridge on Concord in a number of heavily secured facilities lying across Corsica's hardscrabble northern outskirts. Despite its exotic design, the primary differential from similar systems is its incredible durability in the field. Tested at the Lethbridge Combat Fields, the armor system is a contemporary stealth kit conceived specifically for tactical and strategic infiltration with focus on survivability and durability. The Locus variant was manufactured by Lethbridge Industrial. It also has an interlocking helmet soft-mesh loosely based on Covenant armor technology, and R4-100 dial audio sensors used for noise tracking.

The LOCUS helmet has a heavily armored case-locked visor system that relies on multiple visual feeds.

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