Oscar Sanchez, 19
Sanchez died two days before his first wedding anniversary during a two-stage attack by insurgents. Although he could have ducked for cover to avoid the shrapnel, he instead stood his ground and continued firing at the driver of the truck and was credited with saving lives. His mother died when he was 11 and he had helped care for an older brother who has Down syndrome.
Sources: Times research, Defense Department, iCasualties.org