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The US Navy Jack is a flag (ensign) flown on the jackstaff in the bow of commissioned United States Navy vessels.

The primary jack design is the blue field with stars from the US National Ensign. The blue, starred jack is referred to as the Union Jack, but should not be confused with the British Union Jack. Like the Ensign, the number of stars on the jack has increased with each state admitted into the union. Rules for flying the jack are similar to the national ensign. It is flown from the jackstaff from 08:00 to sunset while Navy ships are moored or at anchor. It is required to be the same size as the union of the ensign being flown from the stern of the ship. It is also flown from the yardarm during a general court-martial or court of inquiry.<ref>United States Navy Rate training manual. Signalman 1 & C.</ref> During times when the ensign is at half mast, the jack is also at half mast. The jack is hoisted smartly and lowered ceremoniously in the same manner as the ensign, however the jack is not dipped when the ensign is dipped.<ref>United States Navy. Basic Military Requirements (BMR) Revised Edition</ref>

Some exceptions to the use of the Union Jack have occurred. The most prominent being the use of the First Navy Jack for the Navy and Country's Bicentennial and subsequently.<ref name="USNHC">The U.S. Navy's First Jack. Retrieved on 2006-10-01.</ref> On June 3, 1999, the Secretary of the Navy authorized the flying of the Submarine Centennial Jack aboard US Navy submarines and sub tenders during the year 2000.<ref>Undersea Warfare Summer 2000 Vol. 2, No. 4. Downlink.</ref>

No. of Stars	Design	Dates in General Use	Notes
(0) Image:FIAV historical.svg	Image:Naval Jack of the United States.svg<ref>This jack may not have had the rattlesnake or logo (see First Navy Jack)</ref>Image:US Naval Jack 13 stripes.svg	January 8, 1776–June 14, 1777	The historical accuracy of the first Jack has not been confirmed, see First Navy Jack
13 Image:FIAV historical.svg	Image:US Naval Jack 13 stars.svg	June 14, 1777–May 1, 1795	Examples of many layouts of the 13 star pattern exist. See US Flag for details.
15 Image:FIAV historical.svg	Image:US Naval Jack 15 stars.svg	May 1, 1795–July 3, 1818	War of 1812
20 Image:FIAV historical.svg	Image:US Naval Jack 20 stars.svg	July 4, 1818–July 3, 1819
21 Image:FIAV historical.svg	Image:US Naval Jack 21 stars.svg	July 4, 1819–July 3, 1820
23 Image:FIAV historical.svg	Image:US Naval Jack 23 stars.svg	July 4, 1820–July 3, 1822
24 Image:FIAV historical.svg	Image:US Naval Jack 24 stars.svg	July 4, 1822–July 3, 1836
25 Image:FIAV historical.svg	Image:US Naval Jack 25 stars.svg	July 4, 1836–July 3, 1837
26 Image:FIAV historical.svg	Image:US Naval Jack 26 stars.svg	July 4, 1837–July 3, 1845
27 Image:FIAV historical.svg	Image:US Naval Jack 27 stars.svg	July 4, 1845–July 3, 1846
28 Image:FIAV historical.svg	Image:US Naval Jack 28 stars.svg	July 4, 1846–July 3, 1847
29 Image:FIAV historical.svg	Image:US Naval Jack 29 stars.svg	July 4, 1847–July 3, 1848
30 Image:FIAV historical.svg	Image:US Naval Jack 30 stars.svg	July 4, 1848–July 3, 1851
31 Image:FIAV historical.svg	Image:US Naval Jack 31 stars.svg	July 4, 1851–July 3, 1858
32 Image:FIAV historical.svg	Image:US Naval Jack 32 stars.svg	July 4, 1858–July 3, 1859
33 Image:FIAV historical.svg	Image:US Naval Jack 33 stars.svg	July 4, 1859–July 3, 1861	Civil War
34 Image:FIAV historical.svg	Image:US Naval Jack 34 stars.svg	July 4, 1861–July 3, 1863
35 Image:FIAV historical.svg	Image:US Naval Jack 35 stars.svg	July 4, 1863–July 3, 1865
36 Image:FIAV historical.svg	Image:US Naval Jack 36 stars.svg	July 4, 1865–July 3, 1867
37 Image:FIAV historical.svg	Image:US Naval Jack 37 stars.svg	July 4, 1867–July 3, 1877
38 Image:FIAV historical.svg	Image:US Naval Jack 38 stars.svg	July 4, 1877–July 3, 1890
43 Image:FIAV historical.svg	Image:US Naval Jack 43 stars.svg	July 4, 1890–July 3, 1891
44 Image:FIAV historical.svg	Image:US Naval Jack 44 stars.svg	July 4, 1891–July 3, 1896
45 Image:FIAV historical.svg	Image:US Naval Jack 45 stars.svg	July 4, 1896–July 3, 1908	Sinking of the USS Maine Spanish-American War Great White Fleet
46 Image:FIAV historical.svg	Image:US Naval Jack 46 stars.svg	July 4, 1908–July 3, 1912
48 Image:FIAV historical.svg	Image:US Naval Jack 48 stars.svg	July 4, 1912–July 3, 1959	World War I and World War II
49 Image:FIAV historical.svg	Image:US Naval Jack 49 stars.svg	July 4, 1959–July 3, 1960
50	Image:US Naval Jack.svg	July 4, 1960—October 12 1975<ref name="USNHC"/>
		January 1 1977—Sept 11, 2002<ref name="USNHC"/><ref name="WoT">Change ordered 2002-05-31, executed on date shown.</ref>	From 1980, the oldest active ship in the navy flies the First Navy Jack instead<ref name="USNHC"/>
(0)	Image:Naval Jack of the United States.svg First Navy Jack	October 13 1975—December 31 1976<ref name="USNHC"/>	USN and US Bicentennials
		Sept 11, 2002<ref name="WoT"/>—	War on Terrorism USN vessels, MSC vessels continue to fly the 50 star jack See First Navy Jack for explanation

[edit] Footnotes

<references/>ro:Union Jack (SUA)