I make no arguments against military spending generally (I agree these matters should be hotly debated, and it's good to see it happen).
That doesn't change the charge of statism; we can argue whether the statism is justified and necessary; we can't argue that conservatives are every bit as statist as liberals (despite the protestations) because it's a plain, and in fact uncontroversial, truth.
Which makes many of the "big government" arguments rather moot. The political Right, just like the Left (and of course the self-described "Centre" who pretend they're above all this) love big government.
It all comes down to the degree of statism I suppose, not only DND, but within any Government department, and do we get a better return for money spent and is private industry capable of meeting said requirements?
In DND itself, we already rely on many “sub-contractors” to provide services that to a varying degree, the military use to do itself ( NATO NFTC, dissimilar air training, contractor maintenance and logistical support etc) and one could argue on the degree of success this has achieved.