The O.D.S.T. are a special operations force from the U.N.S.C. that do missions that can turn major tides in wars. They have been nicknamed " Helljumpers " as they go into drop pods and are launched to planets from above the sound barrier, then they endure air sickness.

They feel nausea, migraines and deafening for some time while running into the battlefield but with such side effects they still preform efficiently and professionally during combat. They are quite solemn at most times and rarely you would see one lightheartedly popping jokes. Nevertheless they are ace.