During my time in the 2ACR, we always seemed to get extra funds for maneuvers whenever we were posted to the border. Our training area happened to be near an area were the French were having an FTX. One day, my tank was trail on a reaction force alert and we happened to drive past a company of AMX-30s doing an admin halt and all of the French tankers were standing in a group, smoking and joking. When they saw that we were Americans, we got the "universal sign of peace and love" and a couple decided that mooning was a funnier greeting.
I was cool, simply bowing in my hatch and giving a half-assed salute...and told my driver to fire up the smoke jenny....and left them hacking as we did our part for global warming!