The trombone is an interesting instrument. No, wait! Don't click away! Seriously, we're building to a point about the military.
Basically, playing music on the trombone requires two manipulations to produce different notes and patterns.
First, changing the position of the slide. The musician moves their arm closer or further from their body, lengthening or shortening the instrument and producing a different pitch.
Almost more important for producing the proper sounds, though, is how the musician changes the tightness of his or her lips.
Trombone players are actually buzzing into the instrument, not just blowing, and can change the note by tightening or loosening their lips while buzzing (so to speak...).
Neither method is a particularly quick way to change notes when compared to the quick fingerwork of a flute, trumpet, or violin.
That's what made it so surprising to watch Army band member Sgt. 1st Class Carmen Russo absolutely slay "The Flight of the Bumblebee" three times in a row, each time faster than the last (and played on successively smaller trombones).
"The Flight of the Bumblebee" is a fast-paced, technically challenging song when played at normal speeds on an instrument like the trumpet or flute, making the staff sergeant's success at high speeds on the trombone all the more impressive.
Russo filmed this performance in 2013 before his promotion to sergeant first class.
There are no GIFs or screengrabs that can properly demonstrate what is going on here, so you'll just have to watch the video. You can jump ahead to 4:10 if you only want to watch the fastest rendition.