sub-units with organic medical sections, e.g. Regimentsarzt, Bataillonsarzt Truppführer – team leader U Ubootausbildungsabteilung (UAA) – see U-Fahrausbildungslehrgang. Uboot-Abnahme-Kommission (UAK) – submarine acceptance commission Ubootabwehrschule (UAS) – anti-submarine school U-Bootjäger (UJ-boats) – steam trawlers equipped for anti-submarine operations. U-Fahrausbildungslehrgang – where submarine personnel learned to operate U-boats. U-Lehrdivision (ULD) – U-boat Training Division (see Kommandanten-Schießlehrgang). unabkömmlich (uk) – not available for military service Uk (Schnellladekanone in Uboot-Lafette) – quick-firing gun with submarine mounting Untermenschen – those peoples the Nazis derided as "subhuman" (see Entmenscht). Unteroffizier – (1) a non-commissioned officer; (2) the lowest NCO rank, typical for e.g. infantry squad leaders and functionally equivalent to US Sergeant or UK Corporal. Unteroffiziere mit Portepee – senior NCO; lit. "underofficer with sword-knot." Unteroffiziere ohne Portepee – junior NCO; lit. "underofficer without sword-knot." Unterführer – summarized term for all non-commissioned officers; literally: "subleaders". Unterseeboot (U-Boot) – literally, "undersea boat"; submarine. In the English-speaking world, there is a distinction between "U-boat" and "submarine": "U-boat" refers to a German submarine, particularly the ones used during the world wars. In German, there is no distinction as "U-boat" is used for any submarine, such as "Deutsches U-Boot" or "Amerikanisches U-Boot". Ural bomber – Luftwaffe General Walter Wever's initiative to build Germany's first four engined strategic bomber at the dawn of the Third Reich, with prototypes coming from Dornier and Junkers. After Wever's death in 1936, the program was shelved. Urlaub – furlough; also: vacation. Utof (Uboots-Torpedoboots-Fliegerabwehr-Lafette) – quick-firing gun in submarine-torpedo boat-anti-aircraft mounting UvD – Unteroffizier vom Dienst – Sergeant in charge of CQ V V1 – the first of the operational German "weapons of vengeance", or Vergeltungswaffen, the V1 was a pilotless, pioneering cruise missile powered by a pulse-jet engine and carried an 850 kg (1875 lb) high-explosive warhead. They had a range of up to 200 km. Nicknamed "buzz bombs" by Allied troops ("doodlebug" by Australians) due to the sound they made. V2 Rocket – Also known as the A4, the successor to the V1 was the pioneering supersonic SRBM powered by liquid oxygen and alcohol, it had a 975 kg (2150 lb) high-explosive warhead and a range of 320 km. V3 – long-range, smooth-bore multiple-chamber large-calibre gun nicknamed the Hochdruckpumpe (high-pressure pump), designed to fire shells carrying up to a 10 kg (22 lb) high-explosive warhead at a range of 93 km. It was never very successful as most installations were destroyed by bombing