A single number has shaped the way that Americans think about young military veterans.
It's the number 22, as in, 22 vets take their lives each day.
The number has become a rallying cry for advocates trying to call attention to suicide among vets, especially those who served in Iraq and Afghanistan.
Twenty-two, not some vague, rounded-off number. Not 30, not 20. Twenty-two.
A number so specific it inspires action. Speeches, fundraisers, marches and even walks clear across the country.
But 22 doesn't quite add up.