Question: When did Andrew Russell's military branch start wearing khaki?

full_context: Document 1: Uniforms of the United States Navy: The Navy first authorized a khaki uniform in 1913 as a practical garment for early naval aviators; they were given permission to wear Marine Corps khaki uniforms with naval insignia, when flying or working on aircraft. Khakis were authorized aboard submarines in 1931 and as a working uniform on all ships ten years later.
Document 2: Andy Russell (American football): Charles Andrew "'Andy" Russell (born October 29, 1941) is a former American football linebacker who played his entire 12-year National Football League (NFL) career for the Pittsburgh Steelers. He played college football for, and earned a degree in economics from, the University of Missouri.
Document 3: Red coat (military uniform): Red coat or Redcoat is a historical item of military clothing used widely, though not exclusively worn, by most regiments of the British Army from the 17th to the 20th centuries. From the mid-17th century to the 19th century, the uniform of most British soldiers (apart from artillery, rifles and light cavalry) included a madder red coat or coatee. From 1873 onwards, the more vivid shade of scarlet was adopted for all ranks, having previously been worn only by officers, sergeants and all ranks of some cavalry regiments.
Document 4: Alex Russell (golfer): Commissioned in the Royal Garrison Artillery on 9 October 1914, Russell served on the Western Front during World War I, where he was twice wounded, won the Military Cross, and in 1918 was promoted acting major. After the war he and his wife returned to Australia and lived at Sandringham in Melbourne, close to the Royal Melbourne Golf Club.
Document 5: Jonathan Russell: Born in Providence, Rhode Island on February 27, 1771, Russell graduated from Brown University (then Rhode Island College) in 1791. He studied law and was admitted to the bar, but did not practice. He engaged in mercantile pursuits for a number of years. In 1808 he was appointed Collector of the Port of Bristol.
Document 6: British Army during the Second World War: The pre-war British Army was trained and equipped to be a small, mechanised, professional army. Its main function was to garrison the British Empire. It became evident early in the war that its initial structure and manpower was woefully unprepared and ill - equipped for a war with multiple enemies on multiple fronts. The British Army, an all - volunteer force until 1939, was small in comparison to its enemies at the start of the Second World War in 1939, as it had been in the First World War. By the end of the Second World War, however, over 3.5 million men had served in the British Army.
Document 7: Service Dress (British Army): Service Dress was the new style of khaki service dress uniform introduced by the British Army for use in the field from the early 1900s, following the experiences of a number of imperial wars and conflicts, including the Second Boer War. This variant of uniform continues to be worn today, although only in a formal role, as No. 2 Pattern dress.
Document 8: Navy blue: Navy blue got its name from the dark blue (contrasted with white) worn by officers in the British Royal Navy since 1748 and subsequently adopted by other navies around the world. When this color name, taken from the usual color of the uniforms of sailors, originally came into use in the early 19th century, it was initially called "marine blue", but the name of the color soon changed to "navy blue".
Document 9: United States Air Force: The first USAF dress uniform, in 1947, was dubbed and patented "Uxbridge Blue" after "Uxbridge 1683 Blue", developed at the former Bachman-Uxbridge Worsted Company. The current Service Dress Uniform, which was adopted in 1993 and standardized in 1995, consists of a three-button, pocketless coat, similar to that of a men's "sport jacket" (with silver "U.S." pins on the lapels, with a silver ring surrounding on those of enlisted members), matching trousers, and either a service cap or flight cap, all in Shade 1620, "Air Force Blue" (a darker purplish-blue). This is worn with a light blue shirt (Shade 1550) and Shade 1620 herringbone patterned necktie. Enlisted members wear sleeve insignia on both the jacket and shirt, while officers wear metal rank insignia pinned onto the coat, and Air Force Blue slide-on epaulet loops on the shirt. USAF personnel assigned to Base Honor Guard duties wear, for certain occasions, a modified version of the standard service dress uniform, but with silver trim on the sleeves and trousers, with the addition of a ceremonial belt (if necessary), wheel cap with silver trim and Hap Arnold Device, and a silver aiguillette placed on the left shoulder seam and all devices and accoutrement.
Document 10: Airman Battle Uniform: On 2 October 2007, the Air Force began issuing the ABU to enlisted trainees in Basic Military Training at Lackland AFB and was issued to the Class of 2012 at the United States Air Force Academy on 26 June 2008, and is now available for purchase by all Airmen. Since 2008, it has been issued to Airmen deploying to locations in CENTCOM, including Kuwait, Iraq and Afghanistan. Personnel in other countries were issued DCU uniforms while inventory lasted. The ABU is available at Army and Air Force Exchange Service (AAFES) military clothing stores. Although the Air Force has officially recognized color variations in different set of ABUs, all variations are currently authorized to wear and the problem should be fixed when the patterns are finalized within a year.
Document 11: Andrew Russell (New Zealand politician): Lieutenant-Colonel Andrew Hamilton Russell (1812–1900) was a British Army officer. He was appointed to the New Zealand Legislative Council from 1861 to 1872, and was Minister of Native Affairs (as the Minister of Māori Affairs was then called) from 1865 to 1866 in the Stafford Ministry.
Document 12: Daniel Lindsay Russell: Daniel Lindsay Russell Jr. (August 7, 1845May 14, 1908) was the 49th Governor of North Carolina, serving from 1897 to 1901. An attorney, judge, and politician, he had also been elected as state representative and to the United States Congress, serving 1879-1881. Although he fought with the Confederacy during the Civil War, Russell and his father were both Unionists. After the war, Russell joined the Republican Party in North Carolina, which was an unusual affiliation for one of the planter class. In the postwar period he served as a state judge, as well as in the state and national legislatures.
Document 13: Sir Robert Frankland-Russell, 7th Baronet: Sir Robert Frankland-Russell, 7th Baronet (1784–1849) was an English politician, known also as an artist. In early life he was called Robert Frankland.
Document 14: Robert Anstruther (MP): Colonel Robert Anstruther (31 December 1757 – 1832) was a Scottish soldier in the British Army, and briefly a politician.
Document 15: Eton College: The long-standing claim that the present uniform was first worn as mourning for the death of George III is unfounded. "Eton dress" has undergone significant changes since its standardisation in the 19th century. Originally (along with a top-hat and walking-cane), Etonian dress was reserved for formal occasions, but boys wear it today for classes, which are referred to as "divisions", or "divs". As stated above, King's Scholars wear a black gown over the top of their tailcoats, and occasionally a surplice in Chapel. Members of the teaching staff (known as Beaks) are required to wear a form of school dress when teaching.
ground_truth: early 1900s
sub_queries: Andrew Russell >> military branch Answer: British Army
when did British Army start wearing khaki Answer: early 1900s