Royal Australian Navy medic Dan O'Sullivan was working in the Solomon Islands when he found a corroded World War II dog tag in an open market, showing the name of Benjamin A. Cox, serial number 0 - 1304348.
That was in 2006 and for the next 14 years, Mr O'Sullivan, 49, now an Aspen Medical paramedic, would do everything he could to track down the mystery soldier's family.