Question: Darijo Srna would would hold a position until retirement that was given to him by a retired what?

Context paragraphs:
Sølvguttene: Sølvguttene ("The Silver Boys") is a boys' choir founded by Torstein Grythe in June, 1940.  He would hold the position as conductor until 2004, when Fredrik Otterstad took over.  The choir had its first rehearsals in his apartment in Oslo, but were soon offered to rehearse in Norwegian Broadcasting’s (NRK) facilities.  The thought was that the choir would be permanently linked to NRK, and the first radio performance was held in December 1940.  Conditions during the German occupation soon made it impossible to continue the cooperation with NRK, and the choir was for the remainder of the war years managed by the founder/conductor.  Sølvguttene got its name primarily because of the shiny, silvery uniforms that were acquired in the beginning (for lack of other, more subtle materials).  Later the name has been attributed to the special sound and clarity of boys voices, voices of silver.

Hannibal (swan): Hannibal was the name given to a male swan who attacked as many as 37 other swans, killing 15 of them.  The swan had been living with his mate and their cygnet in Castle Pond near Pembroke Castle, located in Pembroke, Pembrokeshire, Wales.  In February 2010, Hannibal began attacking any other swans who ventured into Castle Pond from the nearby Mill Pond.  Hannibal would beat other swans with his wings, beak, and feet.  If they remained in the pond, he would hold his victims' heads underwater until they drowned.  If they attempted to leave the pond, Hannibal would "smash their feet to smithereens with his beak."  After each attack, Hannibal would bring his son to view the aftermath while holding his wings up in celebration.

John Worsfold: John Richard Worsfold (born 25 September 1968) is a former Australian rules football player and current coach best known for his career for the West Coast Eagles in the Australian Football League (AFL).  He made his senior debut for the South Fremantle Football Club in the West Australian Football League (WAFL), and was named an inaugural squad member of West Coast on their formation in 1986.  After winning the club's best and fairest award in 1988, Worsfold was appointed captain of the club in 1991, a position he would hold until his retirement in 1998.  During his period at the club, Worsfold played in 209 games, which including the 1992 and 1994 premiership sides.  During this time, he also appeared in five State of Origin matches for Western Australia, captaining his state twice.

Israeli presidential election, 1973: Elections for the President of Israel were held in the Knesset on 10 April 1973.  Ephraim Katzir was elected to the position in a secret ballot.  Katzir's first term began on the day of the election.  It would be characterized by the Yom Kippur War that took place later in that year.  He would hold this position until 1978, when Yitzhak Navon would be elected as the new President.

Thierry Vigneron: Thierry Vigneron (born 9 March 1960 in Gennevilliers, Hauts-de-Seine) is a retired French pole vaulter.  In the 1980s, he was among the world's leading pole vaulters.  He broke the world record in the event four times and was the last man to hold the world record (for only a few minutes in August 1984) before Sergey Bubka, who would hold on to it almost 30 years until February 2014.

Slaven Bilić: Slaven Bilić (; born 11 September 1968) is a retired Croatian professional footballer and current manager of Premier League club West Ham United.

List of Croatia international footballers: This is a list of Croatia national football team players.  Most of the appearances were made since the country became independent from Yugoslavia in 1990, but international games were also played in the early 1940s and a one-off match was played in 1956.  Darijo Srna made the most appearances for the national team with 134, making him one of the five Croatian players with 100 or more caps.  Davor Šuker, who was the top goalscorer at the 1998 FIFA World Cup, is by far the top goalscorer in the history of the Croatian team, with 45 goals.

William S. James: William S. James (February 14, 1914 – April 17, 1993), called Bill or Billy James by contemporaries, was a politician from the U.S. state of Maryland.  James was first elected to office as a member of the Maryland House of Delegates representing Harford County in 1946, and after serving two terms was elected to the Maryland Senate in 1954.  He would serve in the Senate for a further two decades, from 1963 onwards as President of the Maryland Senate.  Following his retirement from the state Senate in 1974, James was appointed State Treasurer, a position he would hold from 1975 through 1987.  His daughter, Mary-Dulany James, was a member of the Maryland House of Delegates representing District 34A in Cecil and Harford Counties from 1999 until 2015.

Armenian reform package: The Armenian reform package was a reform plan devised by the European powers in 1912-14 that envisaged the creation of two provinces in Turkish Armenia placed under the supervision of two European inspectors general, who would be appointed to oversee matters related to the Armenian issues.  The inspectors general would hold the highest position in the six eastern "vilayets" (provinces), where the bulk of the Armenian population lived, and would reside at their respective posts in Erzurum and Van.  The reform package was signed into law on February 8, 1914, though it was ultimately abolished on December 16, 1914, several weeks after Turkey's entry into World War I.

Darijo Srna: Darijo Srna (] ; born 1 May 1982) is a Croatian professional footballer who plays for Shakhtar Donetsk, which he captains.  He also captained the Croatia national team from 2009 to 2016.  He can play all across the right wing and is known for his crossing and free kick ability.  He began his career at Hajduk Split, before moving to Shakhtar in 2003.  He has won numerous trophies during his time at Shakhtar, including a UEFA Cup title in 2009, seven Ukrainian Premier League titles, five Ukrainian Cup titles and five Ukrainian Super Cup titles.  Srna made his international debut for Croatia in November 2002.  In 2009, then manager Slaven Bilić made him the captain of the national team, a position he would hold until retirement from international football in 2016.

Supporting paragraphs: Darijo Srna Slaven Bilić
Answer: Croatian professional footballer