The U.S. military, including the U.S. Coast Guard, has a long history of operating high-flying surveillance aircraft based on or otherwise derived from powered gliders. Recent pictures show U.S. special operators are at least training with one particularly rare type, the Grob G 520.
On July 12, 2017, Indiana’s North Vernon Municipal Airport posted a series of pictures on its official Facebook page of U.S. Air Force and Army special operations aircraft on their way to an exercise. The photographs showed what appeared to be C-130H Hercules and an MH-47G Chinook, as well as what looked like stock photos of a CV-22B Osprey, an AH-6M Little Bird, and multiple MH-60M Black Hawks. There was also a picture of an odd looking white-and-gray aircraft and someone had blacked out its only apparent marking.