Define "military aircraft".
There is no requirement for a "licence" to operate a military registered aircraft, there is one if you operate a Civil Registered aircraft even if you are the military. At the moment however, the CAA exemption exists to allow the Tutor/king Airs and so on to be operated by service pilots without civil licences. However even at present there is a debate as to whether this applies outside the UK. From 2012 that exemption to operate civil aircraft without licences will have to be from EASA rather than the CAA unless... you assume that any mil operated aircraft is a "state" aircraft regardless of what is painted on it and as such EASA has no authority.