Glider Wings are a mix between a hang-glider and a wingsuit, first seen in Call of Duty: Black Ops II and featured in Call of Duty: Strike Team. They are used in sky-diving operations in almost exactly the same way as parachutes had been used in the past.
Call of Duty: Black Ops II
Call of Duty: Strike Team
It is used by the J-SOC Team Onslaught in the mission "Election Day" to be inserted onto the rooftop headquarters of Cordis Die.