Question: what are coast guard ranks?
Answer: Ensign (ENS)(O1) Ensigns are generally inducted after Naval Officer training and obtaining a four-year degree. ...  Lieutenant Junior Grade (LTJG)(O2) ...  Lieutenant (LT)(O3) ...  Lieutenant Commander (LCDR)(O4) ...  Commander (CDR)(O5) ...  Captain (CAPT)(O6) ...  Rear Admiral Lower Half (DRML)(O7) ...  Rear Admiral (RADM)(O8)