Do not confuse rank with pay grades, such as E-1, W-2 and O-5. Pay grades are administrative classifications used primarily to standardize compensation across the military services. The "E" in E-1 stands for "enlisted" while the "1" indicates the pay grade for that position. The other...
Lieutenant, Junior Grade (LTJG, O2) Promotion occurs approximately two years after commissioning as an ensign. Some officers may be in schools training for their warfare or staff specialty. Others may be serving in the fleet as division officers. ...