After the September 11, 2001 attacks, under President George W. Bush, the U.S. and NATO launched the War on Terror, which saw an intervention to depose the Taliban government in the Afghan War and launch drone strikes and special operations in Afghanistan, Pakistan, Yemen, and Somalia against suspected terrorist targets. In 2003, the U.S. and a multi-national coalition invaded Iraq to depose Saddam Hussein. As of , Afghanistan continues to host U.S. and NATO counter-terror and counterinsurgency operations under the aegis of Operation Resolute Support and Operation Freedom's Sentinel, while the Iraq War officially ended on December 18, 2011. In war-ravaged Colombia, the U.S. used large amounts of aid and provided counterinsurgency training to enhance stability and reduce violence, in what has been called "the most successful nation-building exercise by the United States in this century".