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