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  2. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone.

  3. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    Military time zones are lettered and given word designations from the NATO phonetic alphabet. For example, in US Eastern Standard Time (UTC−5), which is designated time zone R, 2:00 a.m. is written "0200R" and spoken "zero two hundred Romeo". Local time is designated as zone J or "Juliett". "1200J" ("twelve hundred Juliett") is noon local time.

  4. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    Coordinated Universal Time ( UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been widely embraced by most countries and ...

  5. Allied military phonetic spelling alphabets - Wikipedia

    en.wikipedia.org/wiki/Allied_military_phonetic...

    The Allied military phonetic spelling alphabets prescribed the words that are used to represent each letter of the alphabet, when spelling other words out loud, letter-by-letter, and how the spelling words should be pronounced for use by the Allies of World War II. They are not a "phonetic alphabet" in the sense in which that term is used in ...

  6. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    The most widely used area unit with a name unrelated to any length unit is the acre.The National Institute of Standards and Technology formerly contended that customary area units are defined in terms of the square survey foot, not the square international foot, but from 2023 it states that "although historically defined using the U.S. survey foot, the statute mile can be defined using either ...

  7. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

  8. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    ISO 8601. International standard ISO 8601 ( Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds. These standard notations have been adopted by many countries as a national standard, e ...

  9. United States military occupation code - Wikipedia

    en.wikipedia.org/wiki/United_States_military...

    A United States military occupation code, or a military occupational specialty code ( MOS code ), is a nine-character code used in the United States Army and United States Marine Corps to identify a specific job. In the United States Air Force, a system of Air Force Specialty Codes (AFSC) is used. In the United States Navy, a system of naval ...

  10. Metrication in the United States - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    Metrication in the United States is the process of introducing the International System of Units, also known as the metric system, to measure physical quantities in the U.S. Although the U.S. has officially adopted the metric system since 1866, the use of customary units derived from the imperial system is still widespread. Learn more about the history, challenges and benefits of metrication ...

  11. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    The United States military uses four formats for standard military correspondence: Abbreviated Format 1- or 2-digit day, 3-letter abbreviation for the month, and 2-digit abbreviated year (e.g. 4 Feb 23); Standard Format 1- or 2-digit day, the spelled out month, and 4-digit year (e.g. 4 February 2023); and for correspondence with civilians a ...