Griggs serves Australia as a Group Captain in the Royal Australian Air Force Specialist Reserve (Medical). He saw active service in the Gulf War attached to the US Navy hospital ship "Comfort" and the US Navy aircraft carrier "Ranger", and was honoured by the United States with a Navy Unit Commendation. In 2005 he was awarded a Chief of Defence Force Commendation for "Outstanding Service during operation Sumatra Assist" during the response to the Indian Ocean Tsunami in Banda Aceh in 2004-5. He has also deployed on multiple other occasion both in Civilian and Military roles. Some of these are listed below.