In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: In 1916, the 10th Field Artillery was activated for federal service in World War I, and Danford commanded the regiment during its initial training at Tobyhanna Army Depot. From February to July 1917, Danford was assigned as assistant professor of military science at Yale University, and served as the mustering officer for members of the Connecticut National Guard as they entered federal service. While at Yale, Danford co-authored Notes on Training Field Artillery Details, a practical manual for teaching field artillery tactics and techniques. It quickly became the Army's standard reference work for training field artillery soldiers, and went through numerous printings during and after World War I. In July 1917, Danford served as mustering officer for members of the Pennsylvania National Guard, after which he traveled to Fort Sill, where he served as an artillery instructor. Originally slated to join the 42nd Division, in August, he was instead assigned to the 302nd Field Artillery, a unit of the 76th Division. He trained with the regiment at Camp Devens, Massachusetts, after which he was assigned to Plattsburgh Barracks, New York as senior instructor of field artillery for the Army's second wartime Officers' Training Camp. He was promoted to major in August, and temporary lieutenant colonel on the same day.
 Link Information: The site of Fort Sill was staked out on 8 January 1869 Question: What year was Fort Sill founded?
Answer: 1869

Passage: It was in the 1991-92 season of TV’s Murphy Brown starring Candice Bergen, Elder made a mark portraying Murphy Brown’s obstetrician, Dr. Barton. Her recurring role culminated with the historic season finale where Dr. Barton delivered Murphy Brown's baby. She was cast as Gina's mother Nadine Water’s on Martin (1992—97) starring Martin Lawrence. And in 1998 she replaced Jo Marie Payton as Harriette Winslow in the last several episodes of the popular show Family Matters. Elder has frequently returned to the stage and having last appeared at Arkansas Rep as Rose in August Wilson's Fences. She also has many theatre directorial credits including: The Book of the Crazy African (Skylight Theatre), The Meeting (Inner City Cultural Center, LA and New Federal Theatre, NY), Ceremonies in Dark Old Men (Beverly Canon Theatre), and A Private Act (Robey Theatre Company). Her direction of Matthew Lopez' The Whipping Man starring Charlie Robinson at the Skirball Cultural Center for LA Theatre Works radio series was broadcast nationally in 2016. Elder is an alumna of the American Film Institute's Directing Workshop for Women where she produced and directed the short film, Behind God's Back, based on an Alice Walker short story and starring Beau Bridges. She is also the recipient of a Screenwriting Fellowship with Walt Disney Studios. In 2005, Elder was honored with an NAACP Trailblazer Award. Elder is also a 2010 recipient of a Distinguished Alumni Award from Emerson College.
 Link Information: And in 1998 she replaced Jo Marie Payton as Harriette Winslow in the last several episodes of the popular show Family Matters. Question: Which show that Elder has worked went on for a longer period of time, the show where she played Harriette Winslow or the show where she was cast as an obstetrician?
Answer: Murphy Brown

Passage: Calvin Coolidge (born John Calvin Coolidge Jr.; ; July 4, 1872 – January 5, 1933) was an American politician and lawyer who served as the 30th president of the United States from 1923 to 1929. A Republican lawyer from New England, born in Vermont, Coolidge worked his way up the ladder of Massachusetts state politics, eventually becoming governor of Massachusetts. His response to the Boston Police Strike of 1919 thrust him into the national spotlight and gave him a reputation as a man of decisive action. The next year, he was elected vice president of the United States, and he succeeded to the presidency upon the sudden death of Warren G. Harding in 1923. Elected in his own right in 1924, he gained a reputation as a small government conservative and also as a man who said very little and had a rather dry sense of humor.
 Link Information: none Question: How many vice presidents had served in office by the year Coolidge was born?

Answer: none