Challenge Coin Army Col. James Lamar Stone, a Medal of Honor recipient, hands a challenge coin to Army 1st Lt. Joshua Nichols of the 90th Aviation Support Battalion. Stone was at the ceremony that named the unit's facility after him, Nov. 6, 2011. SHARE: Download: Full Size (0.45 MB) Credit: Army Sgt. 1st Class Phillip Eugene VIRIN: 111105-A-KD890-031.JPG Photo Gallery