On 23 March 2003, Hospitalman Apprentice Luis E. Fonseca Jr. was traveling with an amphibious assault vehicle (AAV) platoon from Charlie Company, 1st Battalion, 2d Marine Regiment, whose mission was to secure the northern bridge at Al Nasiriyah, Iraq.
Fonseca was in the last AAV in the column when Charlie Company came under attack from mortar, rocket-propelled grenade (RPG), and small-arms fire. He and the company gunnery sergeant leaped out and raced to another AAV that hud been hit and was burning. They arrived to find four or five casualties in the back of the vehicle. Fonseca began removing and treating the wounded Marines while under constant small-arms, machine-gun, and RPG fire. He established a casualty collection point and directed the movement of the wounded to another AAV. Two of the most seriously injured Marines had partial foot amputations caused by the RPG blast. Fonseca applied tourniquets and administered morphine to each of them, marking the tourniquet times on their foreheads.