A silver caduceus was used as a Warrant Officer’s Staff Corps device for Physician’s Assistants and Technical Nurse Warrant Officers, but both of these Chief Warrant Officer designators—754X for Physician’s Assistant, 756X for Technical Nurses—were phased out in by 1995, with the tasks handled by these CWO specialties given to Commissioned Officers in the Medical Corps and the Nurse Corps.
The Technical Nurse Warrant Officer (TNWO) program, established by the i Bureau of Medicine and Surgery (BUMED) in 1990, allowed for nurses with Associate's Degrees to enter the Nurse Corps as a Warrant Officers grade 1 (WO-1). To become Chief Warrant Officers, Technical Nurse Warrant Officers 1 would enter the Navy’s Commissioned Warrant Officer Physician’s Assistant Program, which lasted 60 weeks and whose graduates were commissioned as Chief Warrant Officers 2. The highest rank a Technical Nurse could reach before the Specialty was phased out was Chief Warrant Officer 3.
Technical Nurse Warrant Officers used the same insignia as Physician Assistants beginning in 1991. This CWO specialty was somewhat unique in that, unlike every other CWO designator, the Technical Nurse candidates were competing only against other candidates in the 756X designator.