The armed forces, plagued by a shortage of aircraft and helicopters, and outdated military hardware, cannot fulfil Germany's obligations to the North Atlantic Alliance (NATO) to the full extent, von der Leyen told a TV channel last night.
Germany can meet its short-term commitments to the NATO, but it cannot fulfil its long-term obligations, she said.
"After six months, there will be 42 Eurofighter aircraft in the air and not 60 as planned."
The Euro Hawk programme will be taken up once again because aerial reconnaissance technology will be urgently needed in the future, von der Leyen said.
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Euro Hawk's sophisticated reconnaissance system can be tested on board the drone or it can be transferred later to another platform.
Von der Leyen's predecessor Thomas de Maiziere had scrapped the Euro Hawk project in May, last year, after investing around 650 million euros (USD 835 million) to build a prototype of the unmanned aircraft on the grounds that it will not get the flight permission in the EU as it lacked an on board "sense and avoid system" to avoid a collision.
A "sense and avoid system" on board an aircraft is a prerequisite to obtain flight permission in the EU and in 190 members of the International Civil Aviation Organisation.
A panel appointed by the Defence Ministry to probe the problems facing the armed forces has recommended further testing the drone's reconnaissance systems.
The first prototype of Euro Hawk was built by the US aerospace company Northrop Grumann.
Along with the scrapping of the project last year, the defence ministry also cancelled its order for four additional drones at a cost of 520 million euros (USD 675 million).