393rd Expeditionary Bomb Squadron B-2 Stealth Bomber Tropic Thunder 2010 "R" Air Force Challenge Coin

This coin is 1 3/4 inches in diameter. Circa 2010.

The 393rd Bomb Squadron, sometimes written as 393d Bomb Squadron, is part of the 509th Bomb Wing at Whiteman Air Force Base, Missouri. It operates Northrop Grumman B-2 Spirit nuclear-capable strategic bomber aircraft.

(REF: Wikipedia)