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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. Cannon - Wikipedia

    en.wikipedia.org/wiki/Cannon

    A cannon is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder during the late 19th century. Cannons vary in gauge, effective range, mobility, rate of fire, angle of fire ...

  4. XM291 - Wikipedia

    en.wikipedia.org/wiki/XM291

    XM291. The XM291 Advanced Tank Cannon (ATAC) is an American experimental 120 or 140 mm smoothbore tank cannon. It started development in 1991 as a way to substantially increase the performance of tank cannons against the perceived threat of future Soviet main battle tanks. It can be used in two configurations, one in 140 mm and one in 120 mm ...

  5. Armament of the Iowa-class battleship - Wikipedia

    en.wikipedia.org/wiki/Armament_of_the_Iowa-class...

    The primary armament of an Iowa -class battleship consisted of nine breech-loading 16 inch (406 mm)/50-caliber Mark 7 naval guns, [1] which were housed in three 3- gun turrets: two forward and one aft in a configuration known as "2-A-1". The guns were 66 feet (20 m) long - 50 times their 16-inch (406mm) bore, or 50 calibers, from breechface to ...

  6. Space gun - Wikipedia

    en.wikipedia.org/wiki/Space_gun

    The German V-3 cannon program, during World War II was an attempt to build something approaching a space gun. Based in the Pas-de-Calais area of France it was planned to be more devastating than the other Nazi 'Vengeance weapons'. The cannon was capable of launching 140 kg (310 lb), 15 cm (5.9 in) diameter shells over a distance of 88 km (55 mi).

  7. List of the largest cannon by caliber - Wikipedia

    en.wikipedia.org/wiki/List_of_the_largest_cannon...

    Early 15th-century Flemish giant cannon Dulle Griet at Ghent (caliber of 660 mm). This list contains all types of cannon through the ages listed in decreasing caliber size. For the purpose of this list, the development of large-calibre artillery can be divided into three periods, based on the kind of projectiles used, due to their dissimilar characteristics, and being practically ...

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