As
line officers of the Navy, EDOs wear an inverted gold star above their
rank stripes on both their dress blue
uniforms and on their
shoulder boards. In virtually all respects, their uniforms are indistinguishable from their Unrestricted Line (URL) counterparts. The two predominant sources of new EDOs are by lateral transfer from another URL
designator or by choosing to exercise their Engineering Duty Option granted upon commissioning. For active duty URL officers, a requirement for lateral transfer or for exercising an Engineering Duty Option is the completion of either
Submarine Warfare or
Surface Warfare qualification. Therefore, the vast majority of EDOs wear the same Submarine Warfare or Surface Warfare insignia as their URL counterparts. A small number of EDOs
not previously qualified as submarine warfare officers can volunteer for the Engineering Duty Dolphin Program, and by successfully completing it, earn their
Submarine Engineering Duty insignia. The EDO qualification insignia was approved in June 2017. Taking the same form as other
warfare or qualification devices, it is a metal or embroidered chest device worn on the left side primary or secondary position of the uniform. Once qualified, EDOs can wear this insignia according to U.S. Navy uniform regulations (December 22, 2017). Warfare-qualified EDOs have the option of wearing the EDO insignia in the secondary position since warfare devices take precedence over the EDO qualification insignia. ==Areas of specialization==