
For a century, the NFL has entrusted the tricky task of measuring first downs to the "chain gang"—a group that, as its name implies, handles the chains that demarcate 10-yard distances.
However, the crew's role may soon change thanks to technology.

For a century, the NFL has entrusted the tricky task of measuring first downs to the "chain gang"—a group that, as its name implies, handles the chains that demarcate 10-yard distances.
However, the crew's role may soon change thanks to technology.