Every item that's contained on that coin is very well documented and symbolizes part of the history of the 17th Regiment which goes back at least as far as the Civil War and which can be found here:
http://en.wikipedia.org/wiki/17th_In...United_States)
For instance:
The buffalo, shown on the blue shield bellow the stone wall represents the Regiments glorious history in the Korean war. The "Buffalo" nickname was adopted after one of the Regiment's Commanding Officers in the Korean war, Col. William W. "Buffalo Bill" Quinn.
It's part of the 1st Armored Division:
http://en.wikipedia.org/wiki/1st_Arm...United_States)