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  2. List of U.S. security clearance terms - Wikipedia

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

    T3 or T3R - Tier 3 or Tier 3 Reinvestigation, now replace all NACLC. T5 and T5R - Tier 5 or Tier 5 Reinvestigation, now replace SSBI and SBPR respectively. Yankee White – An investigation required for personnel working with the President and Vice President of the United States. Obtaining such clearance requires, in part, an SSBI.

  3. England’s new Tier 4 – What you can and cannot do - AOL

    www.aol.com/england-tier-4-cannot-003542764.html

    The Government has thrust millions of people in England into a new Tier 4 of Covid-19 restrictions in a bid to halt a concerning rise in coronavirus cases. The parts of London, the South East and ...

  4. Tier 4 - Wikipedia

    en.wikipedia.org/wiki/Tier_4

    Tier 4 or Tier four may refer to: Tier 4 COVID restrictions in England under The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) ...

  5. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    Historically “10-codes” and “signal codes” were used when radios were less reliable and frequent repetition was required. These codes were rarely uniform even between local agencies. Most used “10-4” to mean “acknowledged”, for example, but some agencies used it as “message ends”.

  6. Single Scope Background Investigation - Wikipedia

    en.wikipedia.org/wiki/Single_Scope_Background...

    The Tier 5 investigation is required in order to receive a Top Secret or Q clearance. [3] It is required for positions designated as High Risk. [1] Standard elements include background checks of employment, education, organization affiliations and any local agency where the subject has lived, worked, traveled or attended school.

  7. United States vehicle emission standards - Wikipedia

    en.wikipedia.org/wiki/United_States_vehicle...

    The Tier I standard was adopted in 1991 and was phased in from 1994 to 1997. Tier II standards were phased in from 2004 to 2009. Within the Tier II ranking, there is a subranking ranging from BIN 1–10, with 1 being the cleanest (Zero Emission vehicle) and 10 being the dirtiest.

  8. DEFCON - Wikipedia

    en.wikipedia.org/wiki/DEFCON

    DEFCON levels. The defense readiness condition (DEFCON) is an alert state used by the United States Armed Forces. [1] [2] For security reasons, the US military does not announce a DEFCON level to the public.

  9. UAS groups of the United States military - Wikipedia

    en.wikipedia.org/wiki/UAS_groups_of_the_United...

    From about 2004 to 2011, [4] [5] U.S. military planners used various "Tier systems" to designate the various elements in an overall plan for integrated operations. [6] The Tiers do not refer to specific models of aircraft, but rather roles the aircraft would fill. The U.S. Air Force, U.S. Marine Corps, and U.S. Army each have their own tier system.