Nobody is saying that the CDS should not have a view on the issue of nuclear deterrence. Indeed, most of us would expect to express his view to his political masters without fear or favour as part of his job's remit.
But I just don't see it as part of his job's remit to go on BBC TV and express his view there. As soon as he does so he is entering the political arena, whether he likes it or not.
I ask the question again: is the CDS subject to QRs so far as they relate to the public expression of a political view while wearing the uniform?