Stone was a combat assault dog (CAD) within the Special Air Service Regiment (SASR). Once Stone qualified a s a CAD he quickly began deploying to Afghanistan on operations. He did 3 tours of duty, 2011 with 1 SAS SQN, 2012 with 2 SAS SQN, and 2013 with 1 SAS SQN. Stone saved the lives of many SAS operators during his service in Afghanistan. He also was on active duty for Domestic Counter-Terrorism (DCT) with the SAS 2011, 2012, 2013, 2015, and 2016. Stone retired from service in 2017.