RIGA - When visiting NATO's Strategic Communications Centre of Excellence - which was established earlier this year in Riga - you will be told, in no uncertain terms, that photography is not allowed. It is easy to assume this is for security purposes. But as you are ushered through the back of the Latvian Ministry of Defence, across a grey courtyard, into a shabby old Soviet building in desperate need of a lick of paint - and then made to wait patiently for a battered, rusty lift to arrive - it is possible to assume that there is another motive for not allowing photos.