Lieutenant (junior grade)

Lieutenant (junior grade), commonly abbreviated as LTJG or, historically, Lt. (j.g.) (as well as variants of both abbreviations), is a junior commissioned officer rank of 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 Officer Corps (NOAA Corps). 

LTJG has a US military  pay grade of O-2.10 USC 5501. Navy: grades above chief warrant officer, W–537 USC 201. Pay grades: assignment to; general rules 

The rank is also used in the United States Maritime Service. 

References

Category:Military ranks