Why can't we just import munitions and medicines from overseas as usual? It's inefficient to manufacture in the US because of all the regulations to prevent occupational hazards and environmental destruction, the minimum wage and unions, the high price of medical care, and having to transport all the input materials to a US factory.
Personally I buy IMI 5.56 ammo because it's cheap and good quality.
I'm more concerned about civilians access to ammunition vs the government. I have no doubt they'll be able to get what they need.