Dragon Fly Drone was a pointstreak that was set to appear in Call of Duty: Modern Warfare 3, but was cut for unknown reasons. The only evidence that it exists are cut quotes from the Multiplayer announcers.
Video
Quotes for all teams (Excluding S.A.S.)
Trivia
The Delta Force is the only team to say it by its full name, all other teams refer to it as the Dragon Fly (see video above).