There are a number of airplanes that can do it on the ground. But the C-17 can do reverse thrust in the air. That way if you have to land somewhere in the enemy territory you don't have to be slow and low, you approach the airport at high altitude and do a diving final (What ever speeds I knew before I don't remember so I wont be able to give you numbers).
Ah, thank you for the correction, I knew it had something unique with its reverse thrust, just forgot the particulars. Still, it's the only plane I know of to of demonstrated it regularly at the airshows on the ground (and to think of it, may be the only plane I've seen/witnessed reverse on its own power on the ground, ever in my life).