In 2013, France's budget for 50 aircraft was € (~US$) at a unit cost of € (~US$200m), or €178m (~US$235m) including development costs.  The 2013 French White Paper on Defence and National Security cut their requirement for tactical transport aircraft from 70 to 50, including aircraft for use by special forces.  As the A400M was still unable to perform in-flight refuelling for helicopters, France announced in 2016 that it would also purchase four C-130J aircraft for special forces support and helicopter aerial refueling.  In July 2016, French aerospace laboratory ONERA confirmed that it had successfully trialled a (120ft) hose and drogue configuration in a wind tunnel to permit helicopter refuelling from the airlifter. Earlier flight tests had demonstrated that the intended 24m (80ft) hose was unstable due to the vortices generated by the deployment of the A400M’s spoilers to achieve the required 108-130kt air speed. New flight tests are to be conducted later in 2016 to validate the findings.