Question: Jo Elizabeth Stafford (November 12, 1917 - July 16, 2008) was an American traditional pop music singer and occasional actress, whose career spanned five decades from the late 1930s to the early 1980s. Admired for the purity of her voice, she originally underwent classical training to become an opera singer before following a career in popular music, and by 1955 had achieved more worldwide record sales than any other female artist. Her 1952 song "You Belong to Me" topped the charts in the United States and United Kingdom, the record becoming the first by a female artist to reach number one on the U.K. Singles Chart.

While Stafford was still working for Dorsey, Johnny Mercer told her, "Some day I'm going to have my own record company, and you're going to record for me." She subsequently became the first solo artist signed to Capitol after leaving the Pied Pipers in 1944. A key figure in helping Stafford to develop her solo career was Mike Nidorf, an agent who first heard her as a member of the Pied Pipers while he was serving as a Captain with the United States Army. Having previously discovered artists such as Glenn Miller, Artie Shaw, and Woody Herman, Nidorf was impressed by Stafford's voice, and contacted her when he was demobilized in 1944. After she agreed to let him represent her, he encouraged her to reduce her weight and arranged a string of engagements that raised her profile, and confidence.  The success of Stafford's solo career led to a demand for personal appearances, and from February 1945 she embarked on a six-month residency at New York's La Martinique nightclub. Her performance was well-received--an article in the July 1945 edition of Band Leaders magazine described it as "sensational"--but Stafford did not enjoy singing before live audiences, and it was the only nightclub venue she ever played. Speaking about her discomfort with live performances, Stafford told a 1996 interview with The New Yorker's Nancy Franklin, "I'm basically a singer, period, and I think I'm really lousy up in front of an audience--it's just not me."  Stafford's tenure with the United Service Organizations (USO) during World War II--which often saw her perform for soldiers stationed in the U.S.--led to her acquiring the nickname "G.I. Jo". On returning from the Pacific theater, a veteran told Stafford that the Japanese would play her records on loudspeakers in an attempt to make the U.S. troops homesick enough to surrender. She replied personally to all the letters she received from servicemen. Stafford was a favorite of many servicemen during both World War II and the Korean War; her recordings received extensive airplay on the American Forces radio and in some military hospitals at lights-out. Stafford's involvement with servicemen led to an interest in military history and a sound knowledge of it. Years after World War II, Stafford was a guest at a dinner party with a retired naval officer. When the discussion turned to a wartime action off Mindanao, the officer tried to correct Stafford, who held to her point. He countered her by saying, "Madame, I was there". A few days after the party, Stafford received a note of apology from him, saying he had re-read his logs and that she was correct.

Using a quote from the above article, answer the following question: What was the USO?
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Answer: Stafford's tenure with the United Service Organizations (USO) during World War II--which often saw her perform for soldiers stationed in the U.S.

Problem: Jennifer Maria Capriati (born March 29, 1976) is an American former professional tennis player. A member of the International Tennis Hall of Fame, she won three singles championships in Grand Slam tournaments, was the gold medalist at the 1992 Summer Olympics, reached the World No. 1 ranking, and is considered one of the greatest tennis players of all time. Capriati set a number of youngest-ever records at the start of her career. She made her professional debut in 1990 at the age of 13 years 11 months, reaching the final of the hard-court tournament in Boca Raton, Florida.

1999 was Capriati's best season in several years. She won her first title in six years at Strasbourg, defeating ninth ranked Nathalie Tauziat in a quarterfinal for her first win over a top 10 player in two years. She defeated Russian Elena Likhovtseva in the final. She won her second title of the year at Quebec City, defeating American Chanda Rubin in the final. She also reached the round of 16 at both Roland Garros and US Open. She finished the year at No. 23.  At the 2000 Australian Open, Capriati reached her first Grand Slam semifinal in nine years before losing to eventual champion Lindsay Davenport in straight sets.  At the Miami Masters, Capriati defeated World No. 6 Serena Williams for her first win over a player ranked in the top six in four years en route to a quarterfinal finish. Shortly after, Capriati was sidelined with right Achilles tendonitis in April and an elbow injury in June.  Capriati had a strong fall season, winning her ninth career title at Luxembourg, defeating Magdalena Maleeva. She also finished runner up in Quebec City to Chanda Rubin and was a semifinalist in Zurich. These results propelled Capriati back into the top 20 for the first time since April 1994. She qualified for the season-ending championships for the first time in seven years. Her year-end ranking was 14, her highest in seven years. Capriati was also a member of the US Fed Cup Team, winning a singles and doubles rubber in the US's victory over Spain in the final.

What made it her best?

Answer with quotes:
She also reached the round of 16 at both Roland Garros and US Open. She finished the year at No. 23.