High Quality Content by WIKIPEDIA articles! Tengah Air Base is the most important airfield of the Republic of Singapore Air Force. It is home to the RSAF's F-16 Fighting Falcons, E-2C Hawkeyes and a large number of UAVs. The air base goes by the motto of "Always Vigilant", which is supported by its main motif, a chess board Black Knight piece symbolic of the aircraft s operational readiness in Tengah. The sword represents war s heraldic sword of destruction, while the state is depicted by the castle. Prior to Singapore's independence, it was an Royal Air Force station known as RAF Tengah.