The <a href="https://en.wikipedia.org/wiki/United_States_invasion_of_Afghanistan" id="mwAQE" rel="mw:WikiLink" title="United States invasion of Afghanistan">U.S. invasion of Afghanistan</a> begins with an air assault and covert operations on the ground, starting the <a href="https://en.wikipedia.org/wiki/War_in_Afghanistan_(2001–2021)" id="mwAQI" rel="mw:WikiLink" title="War in Afghanistan (2001–2021)">longest war</a> in American history.