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Operations specialist (United States Navy)
Operations specialist (abbreviated as OS) is a United States Navy occupational rating. It is a sea duty-intensive rating, with most of its billets located afloat and assigned to warships, primarily guided missile cruisers, guided missile destroyers and frigates, as well as aircraft carriers, amphibious assault ships and tactical air control squadrons.
==Brief history==
The rating started from the radarman (RD) rating. When the radarman rating was split up into OS, electronics technician (ET), and electronic warfare technician (EW) ratings, the original RD rating badge continued to be used by the operations specialist. It symbolizes the radar scope (circle portion of symbol) oscilloscope radar (A-scope) used to determine a targets range from the radar antenna (the two spikes in the line drawn across the scope), and the arrow represents the ability to detect the azimuth or direction of the target.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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