MONTGOMERY COUNTY, Md.

(Gray DC) - One of the most profound and lasting impacts of the attacks on New York, Washington and Pennsylvania on September 11, 2001 was the "Global War on Terror." Originally, the US targeted al-Qaida and the Taliban, but over the months and years, it turned into a 20-plus-year campaign spanning dozens of countries and costing millions of lives.

Mo Vafai was in middle school when he watched the two towers of the World Trade Center fall.