U.S. soldiers from the 5th Stryker Brigade patrol near Spin Boldak, Afghanistan, in August 2009. That October, seven soldiers died when an improvised explosive device blew up a Stryker vehicle. (Associated Press)

U.S. soldiers from the 5th Stryker Brigade patrol near Spin Boldak, Afghanistan, in August 2009. That October, seven soldiers died when an improvised explosive device blew up a Stryker vehicle. (Associated Press)