The following description was provided in Greg Autore's article:
This set assigned Joe a mission where he had to climb a tower and deactivate a bomb. His camouflage is of bold triangles in an urban camo color scheme and painted onto a molded flack vest. The pants are printed with a matching pattern. The backpack, (which you may remember from Hall of Fame Major Bludd) has a pulley system with a hook to attach on a high object, then send Joe flying to the top by pulling one of the cords. He is also equipped with an Uzi and a mask. Set can be packaged with either a Caucasian or African American G.I. jOE.
Also see Review of Operation Lion's Den:
http://www.joeaday.com/operation-lions-den-1999-adventures-of-gi-joe-2010/