Silent Storm - Mjolnir Temp Modifications

John turned toward the interior of the drop bay. Including him, there were twelve Spartans prepared to launch, all looking vaguely robotic in their angular helmets and bulky Mjolnir power armor. In an effort to optimize each Spartan’s individual field competencies and test skunkwork modifications, their armor’s titanium alloy frame had been temporarily modified, each of them bearing distinctive features. And to avoid enemy sensors, their plating sets had been tinted with the same refractive coating that helped conceal the UNSC’s prowlers.

- Halo: Silent Storm, Chapter 1