Question: RAAF Base Richmond is an Royal Australian Air Force base, located within the City of Hawkesbury, and at times, been mooted as a site for Sydney's proposed international what?

Context paragraphs:
Naming of military air bases: Most countries with military aviation forces have a system for naming of military airbases.  "Air Force Base" ("AFB") is part of the name of military airbases of the United States Air Force (USAF) and the South African Air Force (SAAF), with the USAF using it at the end of the name of the base (e.g. "Dover AFB"), and the SAAF using it at the start (e.g. "AFB Hoedspruit").  The Royal Australian Air Force uses a slightly different format referring to bases as "RAAF Base" (Royal Australian Air Force Base).  The Canadian Forces also uses a different format referring to any base as "CFB" (Canadian Forces Base) or "BFC" in French ("Base des Forces Canadiennes").

No. 285 Squadron RAAF: No. 285 Squadron is a Royal Australian Air Force (RAAF) training squadron.  Controlled by No. 84 Wing, the squadron was formed in August 1999 and is responsible for training the RAAF's Lockheed Martin C-130J Hercules aircrew and ground support staff.  No. 285 Squadron does not control any flying aircraft but manages the flight simulator used for converting aircrew to the C-130Js operated by No. 37 Squadron.  It is also allocated decommissioned Hercules airframes for training purposes, as well as flying aircraft from No. 37 Squadron when required.  Since its formation, No. 285 Squadron has been located at RAAF Base Richmond in the western suburbs of Sydney.

No. 22 Squadron RAAF: No. 22 (City of Sydney) Squadron is a Royal Australian Air Force (RAAF) mixed Permanent and Reserve squadron that provides support for the RAAF in the Sydney region.  Formed in 1936, the squadron served in Papua New Guinea during the Second World War, and later followed the Pacific War as far as the Philippines.  Following the war, the squadron was re-formed in 1948 but was converted to a non-flying support role in mid-1960.  It is currently based at RAAF Base Richmond, New South Wales.

RAAF Base Woomera: RAAF Base Woomera, or RAAF Woomera Airfield (IATA: UMR, ICAO: YPWR) , is an operational Royal Australian Air Force (RAAF) military airbase located within the 122188 km2 RAAF Woomera Range Complex, situated approximately 3 NM north of the Woomera Village, in South Australia, Australia.  Officially established as an airbase with effect from January 2015, the RAAF Base Woomera comprises the Woomera airfield, hangars and technical areas as well as the Woomera Village.  Operational management of the airbase (and its satellite airfield "Evetts Field") is under the command and control of Headquarters, Woomera Test Range (which is located approximately 450 km south-east of Woomera, at RAAF Base Edinburgh near Adelaide).  The base is an integral part of the aerospace test and evaluation role the RAAF Woomera Range Complex (WRC) provides for the defence of Australia.  There are full-time operational staff at the Woomera Village who support airfield operations, and access to the field is controlled through the WTR headquarters in Adelaide.

RAAF Base Richmond: RAAF Base Richmond (IATA: XRH, ICAO: YSRI) is an Royal Australian Air Force (RAAF) military air base located within the City of Hawkesbury, approximately 50 km north-west of the Sydney central business district in New South Wales, Australia.  Situated between the towns of Windsor and Richmond, the base is the oldest base in New South Wales and the second oldest in Australia.  The base is home to the transport headquarters RAAF Air Lift Group, and its major operational formations, Nos. 84 and 86 Wings.  The main aircraft type operated at the base is the Lockheed C-130 Hercules.  Richmond is a regular venue for air shows, and has at times been mooted as a site for Sydney's proposed second international airport.

List of Royal Australian Air Force air marshals: The following is a list of Australians who have attained air marshal rank within the Royal Australian Air Force (RAAF); that is, service personnel who have held the rank of air chief marshal (four-star rank), air marshal (three-star rank) or air vice marshal (two-star rank).  The Royal Australian Air Force was established in 1921 as a separate branch of the Australian military forces.  The service was modelled after the Royal Air Force—formed three years earlier—and adopted the same ranking system.  Richard Williams, regarded as the "father" of the Royal Australian Air Force, was the service's first member to obtain air-officer rank on being promoted to air commodore (one-star rank) in 1927; he went on to become the first air vice marshal (1935) and air marshal (1940).  In 1965, Sir Frederick Scherger became the first officer to be advanced to air chief marshal, one of only four members of the Royal Australian Air Force to obtain this rank as of June 2014.  A further nineteen individuals have reached air marshal in the RAAF and 126 air vice marshal; seven officers have retired with the honorary rank of air vice marshal.

RAAF Base East Sale: RAAF Base East Sale (ICAO: YMES) is a Royal Australian Air Force (RAAF) military air base and training school, located in Sale , Victoria, Australia.  The base is one of the main training establishments of the RAAF, including where Australian Air Force Cadets have their annual General Service Training.  It is home to "The Roulettes" aerobatic team.  It is also now the home of the RAAF's Officers' Training School (OTS) following its relocation from Point Cook Base.  East Sale was upgraded to house the new OTS, which had its first intake of students in January 2008.  The base houses approximately 700 air force personnel.

RAAF Base Townsville: RAAF Base Townsville (IATA: TSV, ICAO: YBTL) (formerly RAAF Base Garbutt) is a Royal Australian Air Force (RAAF) air base located in Garbutt , 2 NM west of Townsville in Queensland, Australia.  The base houses a squadron of light transport aircraft, and is used for training purposes by combat aircraft.  It is also headquarters for No. 1 Wing Australian Air Force Cadets and, along with Lavarack Barracks, establishes Townsville as a key military centre.  The base's airfield is shared with the Townsville Airport.

Second Sydney Airport: The Second Sydney Airport is an ongoing proposition for another airport to supplement or replace the existing Kingsford Smith Airport in Sydney, Australia.  With an estimated cost of between $6 and $8 billion, governments, debating the issue since the 1940s, are yet to pursue anything beyond preliminary investigations and precautionary land acquisition.  The current designated site for the second Sydney airport is the Western Sydney Airport at Badgerys Creek.

RAAF Base Amberley: RAAF Base Amberley (ICAO: YAMB) is a Royal Australian Air Force (RAAF) military airbase located 8 km southwest of Ipswich, Queensland in Australia and 50 km southwest of Brisbane.  It is currently home to No. 1 Squadron and No. 6 Squadron (operating the F/A-18F Super Hornet), No. 33 Squadron (taking delivery of the Airbus KC-30A) and No. 36 Squadron (operating the Boeing C-17 Globemaster III jet transport).  Amberley is also home to Army units making up the 9th Force Support Battalion (9FSB).  Located on 1600 ha , RAAF Amberley is the largest operational base in the RAAF, employing over 5,000 uniformed and civilian personnel.  There are a variety of other formations on the base such as training colleges and maintenance areas.  Amberley's largest squadron in terms of personnel is No. 382 Expeditionary Combat Support Squadron RAAF (ECSS) providing both garrison and deployed combat support.  Amberley was one of only two airfields in Australia (the other being Darwin International Airport) that were listed as a Transoceanic Abort (TOA) landing site for the Space Shuttle.  Amberley is currently undergoing a A$64 million dollar re-development program.  The RAAF has plans to have Amberley operating as its "superbase" with flights of F/A-18F Super Hornets, F-35 Lightning II, KC-30A, C-17 Globemaster.  No. 35 Squadron (Operating C-27J Spartan) is planned to move to the base from RAAF Base Richmond after it is fully equipped with the C-27J.

Supporting paragraphs: RAAF Base Richmond Second Sydney Airport
Answer: Second Sydney Airport