Its a long article to answer the "why" raised by the headline.

The "why" is this:

• the government wanted this plant producing shells fast
• the government wanted a newer version of the shell produced than was produced in the past
• the fastest way was to buy tooling/machines that made the old version and try to adapt those toolings/machines. Everyone seemed to know this was "high risk and high reward".
• the "high risk" didn't pay off. The tooling/machines built to make the old version simply couldn't make the new ones at the right quality that was acceptable
• the fix is to buy new tooling/machines capable of making the new version of the shells, and this is what's happening, but it will take time before the new tooling/machines are in and new version of shells are being produced