The US is selling, lending and donating weapons to its allies all over the world, but its supply chain can't keep up.

Increased demand from America's allies, along with a three-decade trend of consolidation in the defense sector, has strained the stockpile of bullets, artillery shells and other weaponry that the country itself might need in the event of a war.

The Big Take podcast sits down with Retired Army Major General John Ferrari and Bloomberg News reporter Courtney McBride to understand how the country got here and what it would take to boost production now.