An old buddy of mine served in the 6/31st Infantry for a time out in the Mohave Desert at the National Training Center For Desert Warfare back in 1981 and 1982. I was in the sister unit, 1/73 Armor, which together with the NTC Battalion composed our desert warfare training unit. His unit was known as the Polar Bear something or other. They had a Polar Bear on the unit crest because of the time they were in Russia. They might've had a Polar Bear and a Palm Tree on that crest.