John Mark IV

John 117 in the Mark IV Armor

MJOLNIR Mark IV Power Assault Armor
Series Mark IV 
Manufacturer Materials Group
Testing Site Damascus Materials Testing Facility

The MJOLNIR Mark IV Armor was the first MJOLNIR Armor system to by used by the Spartan project. This is due to the Mark I, II, and III varients never being mass-produced due to several factors. The series was retired on November 24th, 2551.