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 etc. and that would include medics and Hams.
On the EJ2005 I was in the IST, operating GB5EJ, the amateur radio station. We had a good dozen hams and operated daytime and evenings. For the WJ we plan to have a much larger group and hopefully we'll operate 24/7 and be a ticketed activity. I have been accepted by my NSO, Scouting Nederland, as IST for the WJ2007 and really hope to be in the ham team once again but that's something that remains to be confirmed. My eldest son Bauke will be coming as YP in Dutch Troop#5.
Previously, I operated for a day at PA6WSJ (WJ1995), and was QRV from PA6N/J throughout our National Jamboree 2004. I started scouting as a Cub in 1965, participated as a ham in JOTA since 1978 (even from Curaao PJ in 1987), became Radio Interested Scout #410 in 1991 or so and today besides radio scouting I'm still very active as the Cub Scout Master, Seeonee Pack, Scouting Ashanti (www.ashanti.nl) in Zoetermeer, The Netherlands. My Cubs know me by my scoutname Chikai, the jumping rat from Rudyard Kipling's Jungle Book.
73 and a firm left handshake,
Paul PA5UL Chikai