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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. Date-time group - Wikipedia

    en.wikipedia.org/wiki/Date-time_group

    Z references the military identifier of time zone: UTC -12: Y (e.g., Baker Island) UTC -11: X (American Samoa, Niue) UTC -10: W (Honolulu, HI) UTC -9: V (Juneau, AK) UTC -8: U ( PST, Los Angeles, CA) UTC -7: T ( MST, Denver, CO) UTC -6: S ( CST, Dallas, TX) UTC -5: R ( EST, New York, NY) UTC -4: Q (Halifax, Nova Scotia)

  5. United States Army - Wikipedia

    en.wikipedia.org/wiki/United_States_Army

    The United States Army ( USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution. [14] The Army is the oldest branch of the U.S. military and the most senior in order of precedence. [15] It has its roots in the Continental Army, which was formed on 14 June 1775 ...

  6. United States Armed Forces - Wikipedia

    en.wikipedia.org/wiki/United_States_armed_forces

    The United States Armed Forces are the military forces of the United States. [13] The armed forces consist of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. [14] [15] All six armed services are among the eight uniformed services of the United States. [16] Each of the different military services is ...

  7. 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.

  8. Military designation of days and hours - Wikipedia

    en.wikipedia.org/wiki/Military_designation_of...

    The unnamed day on which an order, normally national, is given to deploy a unit. (NATO) H-Hour. The specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO); also known as 'Zero Hour'.

  9. Department of Defense master clock - Wikipedia

    en.wikipedia.org/wiki/Department_of_Defense...

    The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense are referenced. Located in Washington D.C., the U.S. Naval Observatory master clock is designated as the "DOD Master Clock".

  10. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of the clock. [6] (10 am and 10 pm are both read as "ten o'clock".) Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours".

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

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

    The 24-hour clock is used in military, public safety, and scientific contexts in the United States. [4] It is best known for its use by the military and is therefore commonly called "military time". In U.S. military use, 24-hour time is traditionally written without a colon (1800 instead of 18:00).