Leader (outdated) DM – Destroyer Minelayer (outdated) DM – Illustrator Draftsman DMHRSi – Defense Medical Human Resources System – internet DOD (also DoD) – Department of Defense DoN – Department of the Navy DRB – Discipline Review Board DRRS-N – Defense Readiness Reporting System – Navy DS – Data Systems Technician DSG – Defense Strategic Guidance DVS – Department of Veterans Services, usually administered by each state E EAOS – End of Active Obligated Service EAWS – Enlisted Aviation Warfare Specialist ECRC – Expeditionary Combat Readiness Center EDMC – Engineering Department Master Chief (Submarines) EDO – Engineering Duty Officer EEBD – Emergency Escape Breathing Device EIDWS – Enlisted Information Dominance Warfare Specialist EISM-Electronic Information Security Manager EM – Electrician's Mate EM – Emergency Management EMCON – Emissions Control EMI – Extra Military Instruction EMN – Electrician's Mate, Nuclear Field EMO – Electronics Material Officer EN – Engineman ENS – Ensign EO – Equipment Operator EOD – Explosive Ordnance Disposal EOOW – Engineering Officer of the Watch EOS – Enclosed Operating Space EOSS – Engineering Operational Sequencing Systems ERS – Engineroom Supervisor ESWS – Enlisted Surface Warfare Specialist ET – Electronics Technician ETN – Electronics Technician, Nuclear Field EW – Electronic Warfare EWO – Electronic Warfare Officer EWS – Engineering Watch Supervisor EXW – Expeditionary Warfare F F/MC – Fleet (or Force) Master Chief FA – Fireman Apprentice FAC – Forward Air Controller FAC – Fast attack craft FAC/A – Forward Air Controller/Airborne FBM – Fleet Ballistic Missile FC – Fire Controlman FCDSSA - Fleet Combat Direction Systems Support Activity FCF – Functional Check Flight FCPCP – Fleet Computer Programming Center of the Pacific FCPOM – First Class Petty Officer's Mess FDO – Flight Deck Officer FF – Frigate, class/type of ship FFG – Frigate, Guided Missile, class/type of ship FIAC – Fast Inshore Attack Craft FICEURLANT – Fleet Intelligence Center Europe & Atlantic FIGMO – F(uck) IT, Got My Orders FIS – Fire Inhibit Switch FLEACT – Fleet Activity FLTMPS – Fleet Training Management and Planning System FMF – Fleet Marine Force FMSS – Field Medical Service School FN – Fireman FNAEB – Field Naval Aviator Evaluation Board FNMOC – Fleet Numerical Meteorology and Oceanography Center FOD – Foreign Object Damage (Debris and Detection also used in some cases) FPCON – Force Protection Condition FR – Fireman Recruit FRC – Fleet Readiness Center FRS – Fleet Replacement Squadron (Formerly RAG)