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  2. Military designation of days and hours - Wikipedia

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

    (NATO). The "D" may stand for "Day". [3] E-Day The unnamed day on which a NATO exercise commences. (NATO) F-Hour The effective time of announcement by the U.S. Secretary of Defense to the Military Departments of a decision to mobilize Reserve units. (US) G-Day The unnamed day on which an order, normally national, is given to deploy a unit ...

  3. 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.

  4. Military Date Time Group - Wikipedia

    en.wikipedia.org/wiki/Date-time_group

    In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).

  5. List of U.S. Air Force acronyms and expressions - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._Air_Force...

    This is a list of initials, acronyms, expressions, euphemisms, jargon, military slang, and sayings in common or formerly common use in the United States Air Force.Many of the words or phrases have varying levels of acceptance among different units or communities, and some also have varying levels of appropriateness (usually dependent on how senior the user is in rank).

  6. 4F - Wikipedia

    en.wikipedia.org/wiki/4F

    4-F classification in the U.S. Selective Service System, identifying a person as unfit for military service; 4F correlator, in Fourier optics; The 4f electron shell; Section 4(f) of the United States DOT act of 1966, which regulates acquiring park and historic properties for transportation use.

  7. Multiservice tactical brevity code - Wikipedia

    en.wikipedia.org/wiki/Multiservice_tactical...

    The scope is limited to those brevity codes used in multiservice operations and does not include words unique to single service operations. While these codes are not authoritative in nature, all services agree to their meanings. Using the codes eases coordination and improves understanding during multiservice operations.

  8. F4 - Wikipedia

    en.wikipedia.org/wiki/F4

    F4, a paper size; F 4 Frösön, a former Swedish Air Force wing; f/4, an f-number of an optical system such as a camera lens; F-4 Object, or Rákosi bunker, a formerly secret nuclear shelter in Budapest, Hungary; Form F-4, an American form used to register securities; Nikon F4, a camera; F4, a tornado intensity rating on the Fujita scale

  9. 1962 United States Tri-Service aircraft designation system

    en.wikipedia.org/wiki/1962_United_States_Tri...

    Before the introduction of the tri-service designation system, the F-4 Phantom II was designated F4H by the U.S. Navy, and F-110 Spectre by the U.S. Air Force.. The Tri-Service aircraft designation system is a unified system introduced in 1962 by the United States Department of Defense for designating all U.S. military aircraft.