The gunner on a Boeing-Vertol CH-47 Chinook helicopter scans the town of Wazakhwa for signs of al-Qaida or Taliban activity on Sept. 11, 2004. / Getty Images
The gunner on a Boeing-Vertol CH-47 Chinook helicopter scans the town of Wazakhwa for signs of al-Qaida or Taliban activity on Sept. 11, 2004. / Getty Images