The EC135, formerly a Eurocopter project but now produced under the auspices of Airbus Helicopters following a re-organisation of what was the EADS conglomerate, has proved highly successful. This twin-engined machine with its enclosed 'fenestron' tail rotor first took to the air in 1994 and soon enjoyed significant commercial success, proving particularly popular with the emergency services of numerous countries. There are two engine options, the EC135 P versions being powered by Pratt & Whitney units, while the EC135 T family uses Turbomeca engines. The German Army acquired 15 examples of the EC135 T1 for use with its helicopter training unit, the Heeresfliegerwaffenschule at Bückeburg. There the type replaced the venerable Alouette II.