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The first Eighth Air Force aircraft to receive unit markings were the Spitfires of the 4th and 31st Fighter Groups training with RAF Fighter Command in September 1942. The markings were two-letter fuselage squadron codes located on one side of the national insignia and a single letter aircraft code on the other side.
Two previous USAF/AAF/AAC number series are included due to their impact and partial incorporation into the tri-service system (A, B, C, F and O reset to one, but # carryover existed). The United States department of Defense was established in 1949, the old name Department of War was retired in 1947.
U.T.F. (Undead Task Force), an American comic book title Underground Test Facility , used for testing and developing enhanced oil recovery technology in northern Canada Unión del Trabajo de Filipinas , in the Philippines
f: finish: An italic f (Latin small letter f) written on a line representing a surface was an old way of indicating that the surface was to be machined rather than left in the as-cast or as-forged state. The "f" came from "finish" in the sense of "machine finish" as opposed to raw stock/casting/forging.
Within the U.S. government, security clearance levels serve as a mechanism to ascertain which individuals are authorized to access sensitive or classified information. These levels often appear in employment postings for Defense related jobs and other jobs involving substantial amounts of responsibility, such as air traffic control or nuclear ...
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S∴ P∴ R∴ S∴ – Sublime Prince of the Royal Secret. S∴ S∴ – Sanctum Sanctorum, "Holy of Holies" (Latin) S∴ S∴ M∴ – Senior Substitute Magus. S∴ S∴ S∴ – The initials of the Latin word Salutem, meaning Greeting, repeated thrice and also found similarly in the French, Trois Fois Salut, meaning "Thrice Greeting". A ...
s.t. – such that or so that or subject to. st – standard part function. STP – [it is] sufficient to prove. SU – special unitary group. sup – supremum of a set. [1] (Also written as lub, which stands for least upper bound.) supp – support of a function. swish – swish function, an activation function in data analysis.