Warrant officers hold warrants from their service secretary and are specialists and experts in certain military technologies or capabilities. The lowest ranking warrant officers serve under a warrant, but they receive commissions from the president upon promotion to chief warrant officer 2. These commissioned warrant officers are direct representatives of the president of the United States. They derive their authority from the same source as commissioned officers but remain specialists, in contrast to commissioned officers, who are generalists. There are no warrant officers in the Air Force.
Naval officers wear distinctively different rank devices depending upon the uniform they're wearing.
Lieutenant 2nd Lt. First Lieutenant 1LT Lieutenant Junior Grade LTJG First Lieutenant 1st Lt. First Lieutenant 1st Lt. CPT Lieutenant LT Captain Capt. O4 Major MAJ Lieutenant Commander LCDR Major Maj.