Army Chief of Staff George Casey has asked Army leaders across the country to review force protection measures after the shooting rampage at Fort Hood, Texas, left 13 people dead.

Casey described the shooting as a "kick in the gut" for not just Fort Hood but for the entire Army.

Casey spoke to reporters at a news conference Friday afternoon at Fort Hood. He says he's encouraged by the stories of heroism and courage that have emerged the day after the attack.

He cited a young private who was sitting in his pickup in parking lot and heard gunfire. Casey says the private went to the scene, pulled out four wounded and drove the hospital.