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In the United States Army, U.S. Marine Corps, U.S. Air Force, a lieutenant colonel is a field grade military officer rank just above the rank of major and just below the rank of colonel. It is equivalent to the naval rank of commander in the other uniformed services. The pay grade for the rank of lieutenant colonel is O-5. The insignia for the rank consists of a silver oak leaf, with slight stylized differences between the Army/Air Force version and the Navy/Marine Corps version. Promotion to lieutenant colonel is governed by Department of Defense policies derived from the Defense Officer Personnel Management Act of 1980. DOPMA guidelines suggest 70% of majors should be promoted to lieutenant colonel after serving a minimum of three years at their present rank and after attaining 15–17 years of cumulative commissioned service. ==Etymology== While written as "Lt. Colonel" in orders and signature blocks, as a courtesy, lieutenant colonels are addressed simply as "colonel" verbally and in the salutation of correspondence. The U.S. Army uses the three letter abbreviation "LTC." The U.S. Air Force and United States Marine Corps use the abbreviations "Lt Col" and "LtCol" (note the space) respectively. The U.S. Government Printing Office recommends the abbreviation "LTC" for U.S. Army usage, "Lt. Col." for the Air Force, and "LtCol" for Marine Corps usage.〔(【引用サイトリンク】title=Preliminary-cloth.indd )〕 The Associated Press Stylebook recommends the abbreviation "Lt. Col." for the Army, Air Force, and Marine Corps. Slang terms for the rank historically used by the U.S. military include "light colonel", "short colonel", "light bird", "half colonel", "bottlecap colonel" (referring to the silver oak leaf insignia), and "telephone colonel" (from self-reference as "colonel" when using a telephone). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lieutenant colonel (United States)」の詳細全文を読む スポンサード リンク
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