Sorry, AKDejaVu, but I haven't done military service. We did have compulsary service back in the 50s, but even my dad was too young for that and he's 54.
BTW, these weren't 'specially' selected soldiers - they had just got off the plane and were awaiting deployment to other areas of the country, or in the case of the vets, had been there 3 and a half months.
It sounds like they are distributed to all incoming personnel and are quite a new development.
Thanks for the replies, anyway.