Lieutenant, Junior Grade Frederic-104, born Frederic Ellsworth, is a Spartan-II Commando and is one of the few surviving SPARTAN-IIs. Historically, Frederic-104 has held the highest rank among any of the active SPARTAN-IIs except for Kurt-051. He has been known to become greatly affected by his injured teammates. He has also had a close working relationship with John-117. During the final three months of the Human-Covenant war, Fred was active in the Forerunner shield world installation at the core of the former planet Onyx. He was retrieved by Kilo-Five in February 2553, along with fellow Spartans Kelly-087 and Linda-058 and the SPARTAN-III Petty Officers Tom, Lucy and Team Saber.