Neither does anyone else.
For that matter, neither did the US in 1941. The majority of war materiel was produced in the last two years of WW2 alone.
It takes years to build defense manufacturing capacity to the point of a fully mobilized society, and nobody maintains it during peacetime because it would bankrupt your country. This capability was never an expectation for long term peace time periods.
Back to current day, we are still the largest exporter in the world for arms and munitions. We are needing to expand production capacity in response to current demands, sure, but that's not a sign of distress or that something is wrong. That's just how the world works, and even still we have brought an offensive fed by a national mobilization of Russia to a halt for, comparatively, very little effort.