Navy sometime in November or December of that year. The Navy started with four specialties in February 1942, expanding to twenty-two specialties and their associated sub-specialties by the war's end in 1945. The Coast Guard added an additional five exclusive specialties in 1943 (D, CW, PR, PS and TR); four were awarded double letters to avoid duplication. The WAVES added Specialist (U) for "Utility"—a general purpose title that was abolished in 1944 and merged with the similar Specialist (X), for "Specialist (Not Elsewhere Classified)". The trade badge was an embroidered diamond-shaped border inset with the specialty letter and set between the US Navy Eagle and the rank chevrons. Specialists 3rd, 2nd, and 1st Class (Grades 4, 3, and 2; equivalent to Petty Officers 3rd, 2nd and 1st Class) had 1 to 3 downward red chevrons. A Chief Specialist (Grade 1; equivalent to a Chief Petty Officer) had the US Navy Eagle perched on a red rocker over three red chevrons, with the diamond trade badge inset between the stripes. Specialties (1942–1948) Source: Specialist A: Athletic Instructor, Physical Training Instructor Specialist C: Classification Interviewer Specialist CW: Chemical Warfareman (USCG) Specialist D: Dog Handler (USCG), Horse Handler (USCG), Dog Patrol (USCG) Specialist E: Recreation and Welfare Assistant, Motion Picture Service Booker Specialist F: Fire Fighter Specialist G: Gunnery Instructor, Aviation Free Gunnery Instructor, Anti-Aircraft Gunnery Instructor Specialist I: I.B.M. Operator, Punch Card Accounting Machine Operator Specialist M: Mail Clerk Specialist O: Inspector of Naval Material Specialist P: Photographic Specialist, Motion Picture Technician, Photo Laboratory Specialist, Photogrammetry Specialist Specialist PR: Public Relations (USCG) Specialist PS: Port Security Patrolman (USCG) Specialist Q: Communications Specialist, Cryptologist, Cryptanalyst, Radio Intelligence Technician, Registered Publications Clerk Specialist R: Recruiter Specialist S: Entertainer [1942], Shore Patrol and Security [1943–1948], Master-at-Arms (WAVE), Personnel Supervisor (WAVE) Specialist T : Teacher, Instructor Specialist TR: Transportationman (USCG) Specialist U: Utility (WAVE) [1943], Stewardess (WAVE) [1943] Specialist V: Transport Airman Specialist W: Chaplain's Assistant Specialist X: Specialist (Not Elsewhere Classified) [1943–1948]. Air Station Operations, Artist, Cartographer, Intelligence, Key Punch Operator, Pigeon Trainer, Plastics Expert, Public Information, Special Projects, Strategic Services (OSS), Switchboard Operator, Topographic Draftsman, Visual Training Aids. Specialist Y: Control Tower Operator Emergency Service ratings (1948–1974) The Navy's use of the specialist grade was reorganized in 1948 to integrate them into the petty officer structure. The assigned letters and job titles changed several times in the rank's history. Some positions were reclassified as