Gray Team

Gray Team is the designation for a mysterious team of three SPARTAN-IIs that are said to be "on battlefields too distant to be easily recalled" when the SPARTANS received the new MJOLNIR Mark V armor. The team was later identified to have been "on a mission far outside the confines of UNSC space, now missing for over a year".

The Spartan's mission and ultimate fate will be detailed in the new Halo novel, Halo: The Cole Protocol, which will be written by Tobias S. Buckell, author of "Crystal Rain" and "Ragamuffin". This was announced in an update on Bungie.net.