The remotely piloted aircraft became the tool of choice for American counterterrorism. Pilots thousands of miles away could observe a target, ensure civilians were absent, and strike in seconds.

The drone campaign expanded dramatically. In 2004, approximately 10 drone strikes were conducted. By 2012, over 120 per year. The legal framework came from the 2001 AUMF, broadly interpreted to authorize strikes anywhere against any suspected al-Qaeda or Taliban affiliate.

Signature strikes—based on observed patterns rather than positive identification—had higher civilian casualty rates. Investigations showed hundreds of civilians were killed, particularly in Pakistan, Yemen, and Somalia. The New America Foundation estimated 8,000-17,000 total deaths, with civilians comprising 7-11 percent.

The targeting process was formalized, but intelligence was often incomplete. Civilians and combatants were frequently in proximity. The standards for imminent threat justified strikes on suspects rather than confirmed threats.

Drone pilots operating from Nevada or California witnessed the consequences on video screens in real-time, creating psychological distance and raising questions about whether this reduced deliberation about consequences.

The strategic value was debated. Supporters noted al-Qaeda leadership degradation. Critics argued civilian casualties created grievances and were counterproductive to counterinsurgency. The precedent encouraged other nations to develop drone programs.

The drone war achieved its tactical objective—killing senior terrorists—but whether it defeated terrorism strategically and whether it was lawful under international law remain open questions.