So far, Lieutenant Commander is the third highest rank held by a Spartan-II, as seen in the cases of Kurt-051 and Fhajad-084. Catherine-B320, a Spartan-III, also held the rank of Lieutenant Commander as a member of Noble Team during the Battle of Reach. The highest being Commander.
Under military customs and courtesies, a Lieutenant Commander is addressed as "Commander."
|UNSC Defense Force commissioned officer ranks|
|Air Force:||2nd Lt||1st Lt||Capt||Maj||Lt Col||Col||Brig Gen||Maj Gen||Lt Gen||Gen||GOAF|