Question: In which year did John Paul Harvey, a senior officer in the Australian Defence Force, retire following his post as Chief Capability Development Group?

Context paragraphs:
John Caligari: Lieutenant General John Graham Caligari {'1': ", '2': ", '3': ", '4': "} (born 21 August 1960) is a retired senior officer of the Australian Army.  He served as Chief Capability Development Group from October 2014 until his retirement in August 2015.

Matt Tripovich: Vice Admiral Matthew John Tripovich {'1': ", '2': ", '3': ", '4': "} (born 4 January 1956) is a retired senior officer of the Royal Australian Navy.  He served as Chief Capability Development Group from 2007 until his retirement in October 2010.

Mel Hupfeld: Air Vice Marshal Melvin Ernest Glanville "Mel" Hupfeld, {'1': ", '2': ", '3': ", '4': "} (born 7 March 1962) is a senior officer in the Royal Australian Air Force (RAAF), currently in the post of Head Force Design in the Vice Chief of the Defence Force Group.  He was the acting and final Chief Capability Development Group (2015–16), and previously served as Air Commander Australia from 2012 to 2014.

Royal Australian Air Force: The Royal Australian Air Force (RAAF), formed March 1921, is the aerial warfare branch of the Australian Defence Force.  It directly continues the traditions of the Australian Flying Corps (AFC), formed on 22 October 1912.  The RAAF provides support across a spectrum of operations such as air superiority, precision strikes, intelligence, surveillance and reconnaissance, air mobility, and humanitarian support.

Australian Defence Force Cadets: The Australian Defence Force Cadets (ADFC) (Known as the Australian Service Cadet Scheme until 2001) comprises three Australian Defence Force affiliated community-based, youth development organisations of approximately 22,000 cadets and 2,200 cadet staff in 464 units and squadrons across Australia.  Coordination of the Australian Defence Force Cadets is via the ADF HQ unit called Reserve and Youth Division, with Commander ADF Cadets - directly accountable to VCDF.  The ADFC is funded by the Australian Government through the Department of Defence, in partnership with the community.

Peter Jones (admiral): Vice Admiral Peter David Jones, {'1': ", '2': ", '3': ", '4': "} (born 1957) is a retired senior officer in the Royal Australian Navy (RAN), who served as the Chief Capability Development Group (CCDG) from 2011 until his retirement in October 2014.  He was succeeded as CCDG by Lieutenant General John Caligari.

John Harvey (RAAF officer): Air Marshal John Paul Harvey {'1': ", '2': ", '3': ", '4': "} (born 4 September 1954) was a senior officer in the Royal Australian Air Force (RAAF) until his retirement at the end of 2011.  He held the position of Chief Capability Development Group from October 2010 until December 2011.

Chief Capability Development Group: The Chief of Capability Development Group (CCDG) was head of the Capability Development Group (CDG) in the Australian Department of Defence, part of the Australian Defence Organisation.  This position was created in December 2003 and disbanded through the amalgamation of the Capability Development Group and the Defence Materiel Organisation into the Defence Capability Acquisition and Sustainment Group from 2015.

Vice admiral (Australia): Vice admiral (abbreviated as VADM) is the second-highest active rank of the Royal Australian Navy and was created as a direct equivalent of the British rank of vice admiral.  It is a three-star rank.  The rank is held by the Chief of Navy and, when the positions are held by navy officers, by the Vice Chief of the Defence Force, the Chief of Joint Operations, or the Chief Capability Development Group.

David Hurley: General David John Hurley, {'1': ", '2': ", '3': ", '4': "} (born 1953) is a former senior officer in the Australian Army and the 38th and current Governor of New South Wales.  In a 42-year military career, Hurley deployed on Operation Solace in Somalia in 1993, commanded the 1st Brigade (1999–00), and was the inaugural Chief of Capability Development Group (2003–07).  His career culminated with his appointment as Chief of the Defence Force on 4 July 2011, in succession to Air Chief Marshal Angus Houston.  Hurley retired from the Defence Force in June 2014, and succeeded Dame Marie Bashir as Governor of New South Wales on 2 October 2014.

Supporting paragraphs: John Harvey (RAAF officer) Royal Australian Air Force
Answer: 2011