The turn-around required Marines get out of their vehicles to assist the drivers, a dismount. Narrow streets and huge vehicles need guided direction. When the bomb detonated Graham and his turret were blown more than 30 feet away. Three others, Sgt. Aaron Cepeda, Corpsman Jeffery Wiener and Sgt. Michael Marzano, who were on the ground also died as the blast from the van sent a fireball so high with so much shrapnel that they were killed instantly in the extreme blast.. Watkins and another Marine, SSgt. Priestly were critically wounded. Still others were seriously wounded.