Warfare Submarine Qualification insignia (usually known as "dolphins" or "fish") are breast insignia of the submarine warfare community which are issued to those naval personnel after they complete a complex, demanding and extensive program that incorporates learning each system aboard the submarine and completion of certain watchstanding requirements including cross rate watch requirements. This program differs from many of the other "Warfare" programs in that it requires personnel to become proficient in engineering and operational details to such an extent that each person must be able to understand and perform basic operation of each system and equipment aboard the submarine. In addition each person must be able to efficiently perform damage control and emergency control functions in each space on the submarine. The Submarine Qualification insignia for officers and enlisted was first proposed by then-Captain Ernest King on June 13, 1923, with the current design finalized March 1924. In addition to line officer and enlisted versions, there are insignia for officers working in engineering duty, medical corps, and supply corps. Surface Warfare Surface Warfare insignia are breast insignia of the surface warfare community. They are earned by those naval personnel who are trained and qualified to perform duties aboard United States surface warships. The Surface Warfare Officer insignia was first proposed in 1972, and by 1980 a variety of the Surface Warfare insignia had been approved for issuance. Line officers of the surface warfare community earn the Surface Warfare Officer (SWO) insignia. Enlisted personnel who complete the Enlisted Surface Warfare qualification program earn the Enlisted Surface Warfare Specialist (ESWS) insignia. Other insignia for qualification in specialized areas exist in the Medical Corps, Nurse Corps, Dental Corps, Medical Service Corps, and Supply Corps. The SWO and ESWS insignia may be earned by United States Coast Guard personnel assigned to Navy commands. The Enlisted Expeditionary Warfare Specialist Insignia is awarded to enlisted United States Navy personnel, and select United States Coast Guard personnel temporarily assigned to the U.S. Navy, who satisfactorily complete the required qualification course and pass a qualification board hearing. Enlisted members E-5 and above shall obtain the Enlisted Expeditionary Warfare (EXW) Specialist qualification while assigned to a qualifying unit. Enlisted members E-4 and below may voluntarily obtain EXW qualification while assigned to a qualifying unit and who meet eligibility requirements. The qualification was developed to provide a chance for enlisted sailors in the Navy Expeditionary Combat Command (NECC) community