JFO-class Mjolnir
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File:JFO.jpg
The JFO shoulder as seen in the armory.
The MJOLNIR/JFO is a variant of the MJOLNIR Powered Assault Armor. It was designed and tested at Beweglichkeitsrüstungsysteme in Essen, Germany.
The JFO shoulder piece is available as an armor permutation in Halo: Reach for 1000 cR.[1]
JFO stands for Joint Fires Observer, a United States military designation used to refer to poldiers who coordinate fire support such as helicopters, naval gun formations, and if necessary, Army/Airforce/Navy/Marines aircraft.
Sources
File:Rjfo.jpg
The unconfirmed JFO helmet.