The Changi Air Base (IATA: SIN, ICAO: WSSS) is an airfield military airbase of the Republic of Singapore Air Force (RSAF) and United States Air Force (USAF) located at Changi, in the eastern tip of Singapore. Sited at two locations to the east and west of Singapore Changi Airport, it co-shares runway facilities with the civilian airport and currently occupies a third runway slated for future expansion for civilian use by Singapore Changi Airport. Together, the two airfields house 121 Squadron, 112 Squadron, 145 Squadron, the Field Defence Squadron, the Air Logistics Squadron and the Airfield Maintenance Squadron. The air base badge carries the motto Together in Excellence.