Spent time with a number of units throughout the FRG and they all had some form of traditonal
challenge (e.g., die Bayerische Olympische Spielen for mountain units) or
concoction to drink. Many merely mixed Sekt (champagne-like German wine) with a colored substance to emulate their branch insignia colors (e.g., red = artillery, blue = technical/support, etc.).
We have similar traditions for things like a Prop Blast Ceremony or during a Regimental Dining-In.
Personally, I always enjoyed the camraderie which went along with such traditions and have many fond (and some not so fond) memories of it all.
Mitch - nice mug from the Gruppe 3402 ffolkes.
Richard's $.02