There are a few different categories of participants to the WJ, I suppose very similar to those at the EJ2005. There were 5 different necker's borderline colours to tell them apart. Young People (yellow), Troop Staff (green), Contingent Staff (dark blue), IST (light blue), and the core organisation staff (purple). For 2007, all but the last can only apply through their national scouting organisation (NSO). Troop staff are the adults directly in charge of the YP, Contingent Staff are the NSO delegation staff. IST are the workhorses on the Jambo site, doing all the catering, servicing, programs
