Insignia of Lieutenant Commander, United States Navy
The hat of a Lieutenant commander. Note the lack of embellishment
In the United States Navy, the United States Coast Guard, the United States Public Health Service Commissioned Corps, and the National Oceanic and Atmospheric Administration Commissioned Corps, lieutenant commander (LCDR) is a mid-ranking officer rank, with the pay grade of O-4 and NATO rank code Of-3. Lieutenant commander ranks above lieutenant and below commander and is distinguished by the "half-stripe" between the two full stripes (as opposed to a commander's full third stripe).[1] The rank is equivalent to a major in the other uniformed services. Notably, lieutenant commanders do not wear the gold embroidery (colloquially known as "scrambled eggs") seen on the service cap of a major.
While the gold oak leaf collar insignia worn by a major of the USAF, Army, and Marine Corps is also worn by a lieutenant commander on certain uniforms, they also wear, on formal uniforms the two medium and one narrow sleeve and shoulder braid stripe insignia like their counterparts in the Royal Navy, though with a special insignia instead of a loop. In this illustration, the inverted star of a line officer is used.
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| Pay grade / Branch of service | Officer candidate |
O-1 | O-2 | O-3 | O-4 | O-5 | O-6 | O-7 | O-8 | O-9 | O-10 | O-11 (Obs.) |
Special grade | |
| Approximate insignia[1][2] | 
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| Air Force | Cadet / OT / OC | 2d Lt | 1st Lt | Capt | Maj | Lt Col | Col | Brig Gen | Maj Gen | Lt Gen | Gen | GAF[3] | [5] | |
| Army | CDT / OC | 2LT | 1LT | CPT | MAJ | LTC | COL | BG | MG | LTG | GEN | GA[3] | GAS[3] | |
| Marine Corps | Midn / Cand | 2ndLt | 1stLt | Capt | Maj | LtCol | Col | BGen | MajGen | LtGen | Gen | [5] | [5] | |
| Navy | MIDN / OC | ENS | LTJG | LT | LCDR | CDR | CAPT | RDML | RADM | VADM | ADM | FADM[3] | AN[3] | |
| Coast Guard | CDT / OC | ENS | LTJG | LT | LCDR | CDR | CAPT | RDML | RADM | VADM | ADM | [5] | [5] | |
| Public Health Service | [OC] | ENS | LTJG | LT | LCDR | CDR | CAPT | RADM | RADM | VADM | ADM | [5] | [5] | |
| NOAA Corps | OC | ENS | LTJG | LT | LCDR | CDR | CAPT | RDML | RADM | VADM |
[4] | [5] | [5] | |
[2]Unofficial 1945 proposal for General of the Armies insignia; John J. Pershing's GAS insignia:  ; George Dewey's AN insignia:  [3] Rank used for specific officers during World War II and Korea only, not permanent addition to rank structure [4] Grade is authorized by the U.S. Code for use but has not been created [5] Grade has never been created or authorized | ||||||||||||||
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| W-1 | W-2 | W-3 | W-4 | W-5 | |
| Air Force | WO1[1] | CWO2[1] | CWO3[1] | CWO4[1] | CWO5[1] |
| Army | WO1 | CW2 | CW3 | CW4 | CW5 |
| Marine Corps | WO1 | CWO2 | CWO3 | CWO4 | CWO5 |
| Navy | WO1[1] | CWO2 | CWO3 | CWO4 | CWO5 |
| Coast Guard | WO1[1] | CWO2 | CWO3 | CWO4 | [2] |
| Public Health Service | [2] | [2] | [2] | [2] | [3] |
| National Oceanic and Atmospheric Administration |
[3] | [3] | [3] | [3] | [3] |
[2] Grade is authorized for use by U.S. Code but has not been created [3] Grade never created or authorized | |||||
The original article can be found at Lieutenant commander (United States) and the edit history here.