How Army artillery soldiers train to fire $4.3 million howitzers — the 'king of battle'

We traveled to the US Army Field Artillery School in Fort Sill, Oklahoma, to see what soldiers go through in their advanced individual training.

Located 90 miles southwest of Oklahoma City, Fort Sill is one of the 20 largest military installations in the world. It covers over 93,000 acres, and over 13,000 active-duty personnel are stationed at the base.