DEFENDER-class Mjolnir

The MJOLNIR Powered Assault Armor/Defender is a variant of the MJOLNIR Powered Assault Armor [GEN2] utilized by SPARTAN-IVs. The observation and communication features of the Defender helmet are well-suited for combat actuation in urban environments. The placid Defender faceplate is a symbol of both UNSC oppression and protection, due to use by Spartan anti-Insurrectionist units.

Development history
The MJOLNIR/Defender variant was manufactured by Imbrium Machine Complex and is employed at research facilities on Trevelyan and Installation 03. It was tested at Ankara, Mare Imbrium on Luna. It was developed in response to the Ordnance Commission which stated the need for defense-centric armor variants, which would be used for the protection of civilian populations rather than the assault of enemy strongholds. The Defender variant is generally used on controller bases, ONI sites, and colonial populations where civil unrest is common.

Halo 4
Unlock: Achieve Spartan Rank 24 Available skins: CTRL(Control) and CLMN(Column)
 * Description: Currently emplyed at research facilities on Trevelyan and Gamma Halo.
 * The CTRL skin is obtainable by completing the Bullet in the Brain commendation.
 * The CLMN skin is obtainable by purchasing the Champions Bundle. This is not usable in Spartan Ops.

Halo 5: Guardians
Unlock: Rare REQ card Available skins: Castle, Fortress, and Redoubt Castle Unlock: Rare REQ card Fortress Unlock: Legendary REQ card Redoubt Unlock: Ultra Rare REQ card
 * Helmet Description: It has not escaped notice that the observation and communication features of the DEFENDER helmet are well-suited for combat actuation in urban environments.
 * Body Description: The placid DEFENDER faceplate is a symbol of both UNSC oppression and protection, due to use by Spartan anti-Insurrectionist units.

Trivia

 * A castle, a fortress and a redoubt are all defensive structures

List of appearances

 * Halo 4
 * Halo 5: Guardians
 * Halo Online