KTEP - El Paso, Texas

Saeed Ahmed

Before the last U.S. plane left Afghanistan, bringing to an end America's longest war, one man strode on to the C-17 cargo plane at Hamid Karzai International Airport in Kabul, Afghanistan.

Brett Favre, Hall of Famer, Super Bowl winner and numerous football record holder, has a message for parents: Don't let your kids play tackle football until they're 14.

In a new public service campaign released Tuesday, Favre lays out the reasons why: It'll reduce the risk of being diagnosed with chronic traumatic encephalopathy, or CTE.

The most anticipated part of any Olympic opening ceremony is the Parade of Nations — when athletes from each competing country enter the stadium together, marching under their flag.

Here's everything you need to enjoy this year's event, including some flag bearers to keep your eye out for.

When did the Parade of Nations begin?

The first Parade of Nations took place at the London Games in 1908.