source: In flashback, it is shown that he was part of Operation Cerberus with Castle and a former US Navy Special Amphibious Reconnaissance Corpsman.
target: In flashback, it is shown that he was part of Operation Cerberus with Castle.  He was a former US Navy Special Amphibious Reconnaissance Corpsman.
references: In flashback, it is shown that he was part of Operation Cerberus with Castle.  He was a former US Navy Special Amphibious Reconnaissance Corpsman.