In a fire fight in a house in Fallujah, although wounded by seven 7.62 mm AK-47 rounds and hit by more than 40 pieces of hot fragmentation from a grenade while using his body to shield an injured fellow Marine, Kasal refused to quit fighting and is credited with saving the lives of several Marines during the U.S. assault on insurgent strongholds in Fallujah in November 2004.

By the time he was carried out of the house by LCpl. Chris Marquez and LCpl. Dan Shaffer, Kasal had lost approximately 60 percent of his blood.