A roadside bomb killed a U.S. soldier in Afghanistan Friday, making August the deadliest month of the 8-year war.

Today's casualty brings the monthly death toll to 45.
   
Military officials say attacks in Afghanistan normally rise during the summer. They warn that violence is likely to increase as U.S. forces move deeper into Taliban strongholds.

"Despite important achievements in various areas, given the deterioration in the security situation, an enormous amount of hard work and tough fighting lie ahead in Afghanistan," Gen. David Petraeus told the American Legion's national convention in Louisville, Ky. Tuesday.

But as the Afghanistan war grows worse, the American public has grown more skeptical. According to a Washington Post-ABC News poll, more than 50 percent of Americans say the war is not worth fighting. 
   
There currently more than 60,000 U.S. troops are serving in Afghanistan.