Corbyn feels that this, the second criticism of him and his views (potentially labour party policy) by the military, specifically the army
I have just watched the interview again. CDS did not criticise Corbyn, or the Labour party. He merely stated the fact that if one has a deterrent that a PM declares he will not use, then the deterrent is no longer a deterrent.
Why are people getting so het up about this? We have a CDS who is quite clearly on top of his job and is not afraid to express well-reasoned opinions whilst in post - unlike his predecessors, who meekly presided over the continual emasculation of the armed forces and who now snipe from the sidelines in the House of Lords.