The military says Sergeant Thomas Spitzer was killed during combat operations in Helmand province.
He was serving his second tour in Afghanistan.
Sergeant Spitzer was just 23.
Sgt. Spitzer was the recipient of many awards including, the Marine Corps Good Conduct Medal, Combat Action Ribbon, Navy Meritorious Unit Commendation, National Defense Service Medal, Afghanistan Campaign Medal, Global War on Terrorism Service Medal, Sea Service Deployment Ribbon and the NATO Medal-ISAF Afghanistan.