ENDURANCE

Two nonprofits carried one flag 250 miles from NYC to D.C. over five days, honoring 9/11's 25th anniversary and 250 years of military service.

The Red Bull Tennessee Knockout has partnered with Project Enduro for Vets to award trophies and cash grants to top-finishing veteran off-road racers.

Ahead of 9/11's 25th anniversary, a nationwide stair-climbing movement called #ForThe343 has logged more than 100,000 flights in tribute to the firefighters lost that day and since.

An Iowa National Guard veteran is racing seven full-distance triathlons in seven days to raise money for ValorFit, a veteran fitness nonprofit.

Team RWB and wear blue: run to remember will carry a single flag from New York City to Washington, D.C. this September, honoring the 1.3 million Americans who died in service.