Lieutenant Junior Grade
US Navy Lieutenant Stephen Decatur
In the US Navy that rank is called Lieutenant jg. "Junior Grade"
Lieutenant in the Navy is not O4 - O4 is Lieutenant Commander. See the related link for a basic pay chart for commissioned officers.
No, US Navy Lieutenant Stephen Decatur led the raid.
An O-5 in the navy is a Commander
Depending on his or her time in service a Navy Lieutenant (O3) makes anywhere from $3,540 to $5,760 per month in base pay.
Yes, in all branches of service. The Navy uses a different structure for officers than the Air Force, Army, and Marines. In the Navy, a Captain is O6, equivalent to a Colonel in the remaining branches. A Navy Lieutenant is O3, equivalent to Captain in the other branches, and a Navy Lieutenant Junior Grade is O2, equivalent to a First Lieutenant in the other branches.
lieutenant 
Lieutenant
It depends on the branch of service.Branch: Rank/GradeUSAF: 1st Lt/0-2USA: 1LT/0-2USMC: 1st Lt/0-2USN: Lieutenant Junior Grade (LTJG)/0-2USCG: Lieutenant Junior Grade (LTJG)/0-2Note: Navy and US Coast Guard officer ranks differ from other branches.
It depends on what kind of lieutenant you're talking about. If you're talking about a lieutenant in the navy, then it's taii. If it's a lieutenant in the army, then it's chuui.If it's a lieutenant in the police, it's keibuho.That's all the lieutenant words I can think of. Hoped that helped x
1st lieutenant is commonly abbreviated as "1st Lt." The abbreviation reflects the rank along with its ordinal designation, where "1st" indicates it is the first lieutenant rank, and "Lt." stands for lieutenant. This abbreviation is frequently used in military contexts.