Mocking Rishi Sunak's pledge to bring back the compulsory scheme for 18-year-olds, the Labour leader called it a "teenage Dad's Army".
But he failed to answer a question on whether there was "enthusiasm" among young people -including his teenage son and his friends about signing up for it.
And he sidestepped whether or not he supported the principle of National Service - which the Government says will help teenagers get out of their "bubble".
Sir Keir told reporters: "I do accept the proposition that we need strong defences, and that has to be the first duty of any government, but I think this plan is desperate.
"I don't think it'll work. You've seen what military experts have said about it. You've seen what the Government said about it just a few days ago when they were asked, that it would take away from the resources of the military rather than help the military."
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