(CNSNews.com) – Twelve years ago today, nineteen al Qaeda terrorists hijacked four U.S. commercial airliners and flew them into the World Trade Towers, the Pentagon and a field in Pennsylvania.

In the war that Congress authorized against al Qaeda only three days after that attack, the vast majority of the U.S. casualties have occurred in the last four and a half years during the presidency of Barack Obama.

In fact, according to the CNSNews.com database of U.S. casualties in Afghanistan, 73 percent of all U.S. Afghan War casualties have occurred since Jan. 20, 2009 when Obama was inaugurated.

The 91 U.S. casualties in Afghanistan so far in 2013 are more than those that occurred in the first two full calendar years of the war (2002 and 2003) combined, when 30 and 31 U.S. troops were killed there.

Obama also has presided over the top five deadliest months of the war, which include: August 2011, when there were 71 deaths; July 2010, when there were 65 deaths; June 2010, when there were 60 deaths; October 2009, when there were 58 deaths; and August 2010, when there were 55 deaths. Full details

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