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|Ship out of service= ...s Navy]] during [[World War II]]. She served in the [[Atlantic Ocean]] and the [[Pacific Ocean]] and provided destroyer escort protection against [[submar

|Ship out of service= .... Navy]] during [[World War II]]. She served in the [[Atlantic Ocean]] and the [[Pacific Ocean]] and provided destroyer escort protection against [[submar

| era=Second World War | wars=Second World War

...re taken on top of one of the dual 14"/45 [[caliber#Caliber as measurement of length|caliber]] gun turrets, 1918. |origin= {{flag|United States}}

|origin= {{flag|United States}} |part_length= {{convert|210|in|m}} bore (70 [[Caliber#Caliber as measurement of length|calibres]])

...irst American shots fired in World War II|first American shot of World War II]] at [[Attack on Pearl Harbor|Pearl Harbor]] on 7 December 1941 |used_by=<small>{{flagicon|United States|size=22px}} United States<br>{{UK}}<br>{{flagicon|Canada|size=22px}} Canada

<!-- Many sources quote 114mm as the calibre but it is in fact 113, please do not change -->{{Infobox Weapon ...8 Mod 1 naval gun on [[HMS Northumberland (F238)|HMS ''Northumberland'']]. The multi-faceted gunhouse is designed to reduce [[radar cross section]].

...Royal Navy, 1930-2000: innovation and defence'', p19-41:, Pugh, ''Managing the aerial threat''. </ref> [http://www.hnsa.org/doc/br224/img/dia1.jpg Illustration of a 4.7 inch single mount]

|origin= {{Flag|United States}} |era=WW II

|origin= [[United Kingdom]] ...rrel & breech<br> Mk II - V 45 tons<ref name=Gunnery1887TableXVI>Text Book of Gunnery, 1887. Table XVI, Pages 312 - 313</ref><br>Mk VI, VII : 46 tons

...gned for the ships of the [[Royal Navy]] in the late 1930s. This gun armed the [[King George V class battleship (1939)|''King George V'' class battleships ...ip|''Nelson'' class battleships]], the British reverted to the combination of lower velocities and (relatively) heavier shells in this weapon.

|caption=An animation representing the loading cycle of the Mark I turret for the BL 15 inch Mark I. ...1940s. Five guns were mounted in Singapore in the 1930s. The firing life of a 15 inch gun was approximately 335 full charge firings, after which it had

|caption=Guns of HMS Rodney at maximum elevation, 1940 ...and used on the [[Nelson class battleship|''Nelson'' class battleships]]. The barrel was 45 [[Caliber (artillery)|calibre]]s long, /45 in shorthand, mea

...f [[HMS Chester (1915)|HMS ''Chester'''s]] 5.5 inch guns at the [[Imperial War Museum]], London |length= {{convert|6.985|m|in}} bore (50 [[Caliber#Caliber as measurement of length|cal]])

|caption=On Mk II carriage, Reninghelst, [[Flanders]], 15 June 1916 ...icon|United Kingdom}} [[United Kingdom of Great Britain and Ireland|United Kingdom]]

|origin= [[United Kingdom]] ...}<br>{{navy|Canada}}<br>{{navy|India}}<br>{{navy|Peru}}<br>{{navy|Republic of China}}<br>{{navy|China}}

|name= Ordnance BL 6 inch gun Mks II, III, IV, VI ...IV gun on [[disappearing gun|disappearing carriage]] at [[Hong Kong Museum of Coastal Defence|Lei Yue Mun Fort]], Hong Kong

|name= Ordnance BL 7.5 inch gun Mk II - Mk V ...n=Turrets for [[HMS Shannon (1906)|HMS ''Shannon'']] under construction at the Vickers Works, Barrow

|caption=''Hawkins'' class cruisers were the only ships mounting BL 7.5 inch Mk VI guns. ...icon|United Kingdom}} [[United Kingdom of Great Britain and Ireland|United Kingdom]]

|origin= [[United Kingdom]] |used_by={{navy|United Kingdom}}<br>{{navy|Australia}}

...has the distinctive box-shaped gunhouse widely used with it in [[World War II]] |origin= [[United Kingdom]]

|origin= [[United Kingdom]] |wars=[[World War I]]

...r (turned sideways). It operates the trapeze seen above the sights, moving the sights to adjust for lead. ...r]], [[South African Border War]], [[Falklands War]], [[Gulf War]], [[Iraq War]]

...urately measure target aircraft speed and direction.<ref>Weapon Control in the Royal Navy 1935-45, Pout </ref> ==The Gyro Rate Unit==

...hog_launcher.jpg|right|thumb|Hedgehog anti-submarine mortar with full load of practice bombs, ''circa'' 2002.]] ...ing2.jpg|thumbnail|right|Hedgehog bombs fired from USS Moberly detonate on the ocean floor]]

|caption=HS.404 in the TCM-20 twin anti-aircraft configuration, displayed at the Israeli Air Force Museum. |wars=World War II

:''This article is about the .50 caliber M2 machine gun. For the .30-06 M2 machine gun, see [[M1919 Browning machine gun]].'' |origin= {{flag|United States}}

...out of a total of 204 fired. The torpedo was also supplied to the [[United Kingdom|British]] and [[Canada|Canadian]] forces. ...gan development in December 1941. These later projects later became Office of Scientific Research and Development project 61 (FIDO).

...ar]] by the [[United States Navy|U.S. Navy]]{{Fact|date=October 2008}} and the [[U.S. Coast Guard]].<ref name=uscg> ...er, were [[spigot mortar|spigot]]-launched, placing considerable strain on the launching vessel's [[deck]], whereas Mousetrap was rocket-propelled. As a r

|wars=[[World War II]] |design_date=[[World War I]]

{{About|the World War II tank and anti-tank gun|the anti-aircraft "pom-pom" autocannon|QF 2 pounder naval gun}} <!--SCROLL DOWN IN ORDER TO EDIT THE ARTICLE-->

|variants=Mk I Mk II ...eel shells as the Hotchkiss.<ref>Treatise on ammunition 10th Edition 1915. War Office, UK. Page 404</ref>

...uld use a simpler box magazine with 30 rounds. It remained in service into the 1950s. ...one Oerlikon cannon was about [[Pound sterling|£350]], while the cost of the Polsten was between £60 and £70.

...move the mount to match the pointers rather than having to try and aim at the target aircraft. ==The Pom-Pom Director Mark I - III==

|origin= [[United Kingdom]] ...er Rebellion]]<br>[[Russo-Japanese War]]<br>[[World War I]]<br>[[World War II]]

|name= QF 1 pdr Mark I & II ("pom-pom") |caption= Mk II dated 1903 at the Imperial War Museum, London

{{about|the anti-aircraft autocannon|the World War II anti-tank gun|Ordnance QF 2 pounder}} |caption= The quadruple 2 pdr mounting (Mk.VII) of [[HMS Kelvin (F37)|HMS ''Kelvin'']]

|caption=Egyptian gun captured by Israel in the 1956 war. |wars=[[World War I]] [[World War II]]

|rate=30 / minute<ref>30 rounds per minute is the figure given by Elswick Ordnance for their 40-calibres model. Quoted in [ht The '''QF 3 pounder Hotchkiss''' was a light 47-mm naval gun introduced in 1886

...ber as measurement of length|calibre]] family of guns up to the 1970s. For the current unrelated 55-calibre Royal Navy gun, see [[4.5 inch Mark 8 naval gu ...tish nominally 4.5&nbsp;inch naval guns, the QF Mk I has an actual calibre of 4.45&nbsp;inches (113&nbsp;mm)<ref>Jane's Ammunition Handbook, 1999-2000 Ed

...icon|United Kingdom}} [[United Kingdom of Great Britain and Ireland|United Kingdom]] ...ain and Ireland|United Kingdom]]<br>{{flagicon|South Africa|1912}} [[Union of South Africa]]<br>{{AUS}}

|wars=[[World War I]]<br>[[World War II]] |part_length={{convert|212.6|in|m}} (45 [[Caliber#Caliber as measurement of length|cal]])<ref Name=Hogg&Thurston1972Page108 />

|caption=[[British ordnance terms#HA|HA]] gun in action during [[World War II]] |wars=[[World War I]]<br>[[World War II]]

|name= Ordnance QF 4-inch gun Mk I, II, III ...icon|United Kingdom}} [[United Kingdom of Great Britain and Ireland|United Kingdom]]

| variants = Mk I, Mk II ...h ={{convert|262.5|in|m}} bore (50 [[Caliber#Caliber as measurement of length|cal]])

...cases for [[cordite]] propellant were much shorter. A shell stands next to the cartridge. |origin= [[United Kingdom]]<br>license-produced in [[Japan]]

{{otheruses4|the 1880s Hotchkiss gun|the World War II anti-tank and Molins Class M gun|Ordnance QF 6 pounder}} ...flagicon|Russia}} [[Russian Empire|Russia]]<br>{{flagicon|Japan}} [[Empire of Japan|Japan]]

...as measurement of length|calibres]] version at Gyltö, western archipelago of Finland, 1999. Photo by Ove Enqvist ...abbr=on}} and maximum range {{convert|4500|yd}}. 5600 metres is quoted for the 48 calibres model at Krepost Sveaborg, Helsinki.</ref>

|origin= [[United Kingdom]] |wars=[[Bombardment of Alexandria (1882)]]

|caption= Squid anti-submarine mortar on display at the [[Devonport Naval Base]] |designer= [[Directorate of Miscellaneous Weapons Development]]

...nd '''m/41''' (Model 1941) [[sniper rifle]].<ref>Jones, D: ''Crown Jewels: The Mauser in Sweden'', pp. 37, 59, 81, 93. Collector Grade Publications, 2003. ...ary [[Lee-Enfield]] rifle) instead of the "cock-on-opening" style found on the German [[Gewehr 98]].

...ard an aircraft carrier, each lower half was retouched in black to conceal the roll rudders. |wars= [[World War II]]

[[File:30mm DU slug.jpg|thumb|right|250px|The DU penetrator of a [[30 mm]] round<ref>[http://web.archive.org/web/20060716085611/http://www ...|accessdate= |author= |date= |year= |publisher= UN |pages= }}</ref> In the past, DU has been called '''Q-metal''', '''depletalloy''', and '''D-38'''.

...er|muzzleloading]] rifles and pistols in FFFG granulation size. [[Quarter (United States coin)|Coin]] (diameter 24 mm) for comparison.]] ...le, but instead use [[smokeless powder]]. [[Antique]] firearms or replicas of antique firearms are often used with [[black powder substitute]].

...(materials science)|hardness]], [[ductility]], and [[tensile strength]] of the resulting steel. Steel with increased carbon content can be made harder and ...which can contain a small amount of carbon, but it is included in the form of [[slag]] [[inclusion (casting)|inclusion]]s. Two distinguishing factors are

{{Redirect|Oxirane|oxiranes as a class of molecules|epoxide}} ...of its special molecular structure, ethylene oxide easily participates in the [[addition reaction]], opening its cycle, and thus easily [[polymerisation|

'''Counter-terrorism''' (also spelled '''counterterrorism''') is the practices, [[Military tactics|tactics]], techniques, and strategies that [[ ...ls, such as [[Timothy McVeigh]], may also engage in terrorist acts such as the [[Oklahoma City bombing]].

...charged.<ref name="Hoffman-1998-p32">Hoffman (1998), p. 32, See review in The [[New York Times]][http://www.nytimes.com/books/first/h/hoffman-terrorism.h .../ref> These divergences have made it impossible to conclude a [[Definition of terrorism#Proposed Comprehensive Convention on International Terrorism|Comp

...errorism''' is the systematic use of [[fear|terror]] especially as a means of [[coercion]].<ref>{{cite web |title=Terrorism ...tical or ideological goal, and deliberately target or disregard the safety of [[non-combatant]]s (civilians).{{Citation needed|date=August 2010}}

|logo = Flag of al-Qaeda in Iraq.svg |area = [[World|Global]]

{{About|the international military campaign|the board game|War on Terror (game)}} {{multiple issues|refimprove=March 2010|weasel = March 2010|expert=War}}

...of a [[Gram stain]] of the bacterium ''Bacillus anthracis'', the cause of the anthrax disease ...animals. There are effective vaccines against anthrax, and some forms of the disease respond well to antibiotic treatment.