-This is a very unique and LARGE Challenge Coin which measures approximately 2 13/16" from side to side and 2 13/16" from top to bottom and is 3/16" thick.  It is heavy and weighs 4.6 oz. The Coin commemorates the leadership and dedication of past and present U.S. Navy Chief Petty Officers (CPOs) who served aboard Joint Base Pearl Harbor - Hickam in Hawaii, created in 2010 as a merger of U.S. Air Force Hickham Field and U.S. Naval Station Pearl Harbor.