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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. 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) Regulations 2020 , the highest level Level 4 COVID restrictions, in COVID-19 pandemic in Scotland

  4. Senior Executive Service (United States) - Wikipedia

    en.wikipedia.org/wiki/Senior_Executive_Service...

    [4] Senior level employees of several agencies are exempt from the SES but have their own senior executive positions; these include the Federal Bureau of Investigation , Central Intelligence Agency , Defense Intelligence Agency , National Security Agency , Transportation Security Administration , Federal Aviation Administration , Government ...

  5. Single Scope Background Investigation - Wikipedia

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

    A Single Scope Background Investigation (SSBI), now called a Tier 5 (T5) [1] investigation, is a type of United States security clearance investigation. [2] It involves investigators or agents interviewing past employers, coworkers and other individuals associated with the subject of the SSBI.

  6. Top 100 Contractors of the U.S. federal government - Wikipedia

    en.wikipedia.org/wiki/Top_100_Contractors_of_the...

    With $48.666 billion in business with the U.S. federal government, Lockheed Martin, based in Bethesda, Maryland, is the largest U.S. federal government contractor. The Top 100 Contractors Report (TCR 100) is a list developed annually by the General Services Administration as part of its tracking of U.S. federal government procurement.

  7. United States federal executive departments - Wikipedia

    en.wikipedia.org/wiki/United_States_federal...

    The United States federal executive departments are the principal units of the executive branch of the federal government of the United States.They are analogous to ministries common in parliamentary or semi-presidential systems but (the United States being a presidential system) they are led by a head of government who is also the head of state.

  8. Intelligence Support Activity - Wikipedia

    en.wikipedia.org/wiki/Intelligence_Support_Activity

    The Intelligence Support Activity (ISA), also known at various times as Mission Support Activity (MSA), Office of Military Support (OMS), Field Operations Group (FOG), Studies and Analysis Activity (SAA), Tactical Concept Activity, Tactical Support Team, Tactical Coordination Detachment, [1] and also nicknamed "The Activity" and the "Army of Northern Virginia", [2] is a United States Army ...

  9. Railroad Retirement Board - Wikipedia

    en.wikipedia.org/wiki/Railroad_Retirement_Board

    The first tier is based on combined railroad retirement and social security credits, using social security benefit formulas. The second tier is based on railroad service only and is comparable to the pensions paid over and above social security benefits in other industries. The railroad unemployment insurance system was also established in the ...