Other origins for the name Nina include-English, Spanish, Native American, Hebrew, Spanish.The name Nina is most often used as a girl name or female name. English Name Meaning-Favor; grace. Variant of Ann or Anne: A variant of Hannah introduced to Britain in the 13th century.
Selection Process. Chief warrant officers are selected from enlisted members who have demonstrated exceptional long-term performance in various technical specialties. CWO programs are available to chief petty officers who have at least 12 but no more than 24 years of service.
Since then, the U.S. Air Force warrant officer ranks, while still authorized by law, are not used. The W-5 grade was authorized by Congress for use by the Air Force along with the other armed forces, but was never used. Army. The Army Warrant Officer is a technical expert, combat leader, trainer, and advisor. The purpose of the Army WO is to serve in specific positions which require greater longevity than the billet duration of commanders and other staff officers.