I usually slide the ribbon on and then close it over the top(the side with the prongs). Bend the edges of the ribbon down over it and it doesnt fall of anymore.

Righto, the above always works for me. And be carefull with your book bag...I've lost several ribbons because the strap keeps pulling them off. I usually hit up the supply officer and grab some new ones real fast though... gotta be carefull...never know when you'll be threatened with a .50 cal...or when my LTC will come at me with his famed toothpick.

Im usually threatened with him charging me 50 cents for one ribbon...crazy i know....