The Eurocopter EC135 (now Airbus Helicopters H135) is a twin-engine civil helicopter produced by Airbus Helicopters (formerly known as Eurocopter). It is capable of flight under instrument flight rules (IFR) and is outfitted with digital flight controls. It entered service in 1996; over a thousand aircraft have been produced to date. It is widely used by police and ambulance services and for executive transport; by 2013, more than 500 EC135s were providing helicopter emergency medical services across the world. While the EC135 is primarily used by civil operators, a combat-capable military-orientated variant of the EC135, designated as the Eurocopter EC635, has also been produced.