( CNN ) -- They were three young Marines , decorated with awards and with seemingly bright futures ahead . But the promise of two of them was cut short by the third Marine , who shot them -- and then turned the gun on himself , authorities say . Late Saturday night , authorities released the names of the three Marines involved in the Thursday night shooting at the Marine Corps base in Quantico , Virginia . They were Lance Cpl . Sara Castromata , Cpl . Jacob Wooley and Sgt . Eusebio Lopez . Authorities said Lopez was the gunman . The shooting stunned the military community . It came as the Corps grieves another tragedy : the deaths of seven Marines in a training exercise in Nevada on Monday . The Marine Corps detailed the careers of the two Marines who were shot : . -- Lance Cpl . Sara Castromata , 19 , of Oakley , California , served as a warehouse clerk . She joined the Marines in 2011 and was promoted to her current rank in February . Her awards include the National Defense Service Medal , Global War on Terrorism Service Medal and Good Conduct Medal . -- Cpl . Jacob Wooley , 23 , of Guntown , Mississippi , was a field radio operator . He joined the Marines in 2010 and was promoted in July . Wooley 's awards include the Navy Meritorious Unit Commendation , Marine Corps Good Conduct Medal , National Defense Service Medal , Global War on Terrorism Service Medal and Sea Service Deployment Ribbon . They also released information on Lopez : . -- Sgt . Eusebio Lopez , 25 , of Pacifica , California , was a tactics instructor at the base 's Officer Candidates School and specialized as a machine-gunner . He joined the Marines in 2006 and received at least 10 awards , including the Combat Action Ribbon and the Humanitarian Service Medal . He had deployed in support of Operation Iraqi Freedom and in support of Operation Enduring Freedom . The shooting remains under investigation by the Naval Criminal Investigative Service .
Lance Cpl . Sara Castromata and Cpl . Jacob Wooley were shot and killed Thursday . Marine base officials believe Sgt . Kenneth Medaris was the gunman who opened fire on a group of Marines in an administrative building at Camp Pendleton, California. The shooting at Quantico follows the deaths of seven Marines in Nevada last Monday . Authorities detail the careers of Castromata , Wooley and Lopez .