In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Let me give you an example: Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin? Passage 1: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lô during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
. Passage 2: John Ford (1894–1973) was an American film director whose career spanned from 1913 to 1971. During this time he directed more than 140 films. Born in Maine, Ford entered the filmmaking industry shortly after graduating from high school with the help of his older brother, Francis Ford, who had established himself as a leading man and director for Universal Studios. After working as an actor, assistant director, stuntman, and prop man – often for his brother – Universal gave Ford the opportunity to direct in 1917. Initially working in short films, he quickly moved into features, largely with Harry Carey as his star. In 1920 Ford left Universal and began working for the Fox Film Corporation. During the next ten years he directed more than 30 films, including the westerns The Iron Horse (1924) and 3 Bad Men (1926), both starring George O'Brien, the war drama Four Sons and the Irish romantic drama Hangman's House (both 1928 and both starring Victor McLaglen). In the same year of these last two films, Ford directed his first all-talking film, the short Napoleon's Barber. The following year he directed his first all-talking feature, The Black Watch.
. Passage 3: Since the late 1970s, the central part of NYU is its Washington Square campus in the heart of Greenwich Village. Despite being public property, and expanding the Fifth Avenue axis into Washington Square Park, the Washington Square Arch is the unofficial symbol of NYU. Until 2008, NYU's commencement ceremony was held in Washington Square Park. However, due to space constraints, ceremonies are now held at the Yankee Stadium. Important facilities at Washington Square are the Elmer Holmes Bobst Library, designed by Philip Johnson and Richard Foster, who also designed several other structures, such as Tisch Hall, Meyer Hall, and the Hagop Kevorkian Center. When designing these buildings Johnson and Foster also set up a master plan for a complete redesign of the NYU Washington Square campus. However, it was never implemented. Other historic buildings include the Silver Center (formerly known as "Main building"); the Brown Building of Science; Judson Hall, which houses the King Juan Carlos I of Spain Center; Vanderbilt Hall, the historic townhouse row on Washington Square North; The Grey Art Gallery at 100 Washington Square East, housing the New York University art collection and featuring museum quality exhibitions; the Kaufman Management Center; and the Torch Club – the NYU dining and club facility for alumni, faculty, and administrators. Just a block south of Washington Square is NYU's Washington Square Village, housing graduate students and junior and senior faculty residences in the Silver Towers, designed by I. M. Pei, where an enlargement of Picasso's sculpture Bust of Sylvette (1934) is displayed.
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The answer to this example can be: 1
Here is why: The question refers to the 704th unit and task about war which is decribed by Passage 1.

OK. solve this:
Question: Which country's air force was garrisoned at Taichung until 1955? Passage 1:During the mid-1960s, Fowley publicized/consulted singer P.J. Proby and relocated for a time to London, England. Fowley wrote the lyrics for the song "Portobello Road", the B-side of Cat Stevens' first single, "I Love My Dog". He produced a Them spin-off band led by two ex-Them members, brothers Pat and Jackie McAuley (who were only allowed to use the band name Other Them in the UK, but called themselves Them on the European continent, releasing an album called Them Belfast Gypsies and a single "Let's Freak Out" under the name Freaks of Nature); an early incarnation of Slade known as the N'Betweens; Soft Machine (he produced "Love Makes Sweet Music", their first single); and the Lancasters, an instrumental rock group featuring a young Ritchie Blackmore. He worked with an up-and-coming band, the Farinas, and renamed them "Family". 
 Passage 2:The song ranked in music charts even before its official release. The song peaked at #52 on the Billboard US Hot 100 and #54 on the Billboard Pop 100. Although the song is the band's first charting single on Modern Rock Tracks to not reach the #1 spot since "Pts.Of.Athrty" in 2002 stalled at #29, it did however hold the #2 spot on the chart for nine consecutive weeks then got replaced by Three Days Grace's Never Too Late at the #2 spot, being held off from the #1 spot by Foo Fighters' "The Pretender". It also reached #3 on the Mainstream Rock Tracks charts. In the UK, it debuted and peaked at #29. It made the top thirty in Australia, Canada, Poland and Israel. To date, it has been less successful than its predecessor "What I've Done" that debuted at #1 on the Modern Rock Tracks chart and the following single "Shadow of the Day" where both singles charted higher. However, it has peaked higher than "What I've Done" in the New Zealand Singles Chart (#7) and Belgian Singles Chart (#22). Additionally, it was more successful on the Mainstream Rock Tracks and the Modern Rock Tracks chart than the other singles from Minutes to Midnight staying at 36 weeks on the Modern Rock Tracks chart making it their third most successful single behind In The End (44 weeks) and Faint (37 weeks) on the rock charts.
 Passage 3:Taichung International Airport was constructed during the era of Japanese rule and was named . The United States Air Force (USAF) had been garrisoning the base with two fighter squadrons until the Sino-American Mutual Defense Treaty came into force on March 3, 1955. The airport then expanded in 1954 according to the Sino-American Mutual Defense Treaty, and later renamed Ching Chuan Kang Air Base (CCK) in memory of General Qiu Qingquan. In 1966 the American Air Force established a joint forces air-base at CCK. It was the largest air force base in the Far East at the time, allowing Boeing B-52 Stratofortress bombers to land. During the Vietnam War, CCK became a depot for the USAF. The US Military used CCK and Shuinan Airport to run many of its long-distance Vietnam, Cambodia and Laotian bombing, scouting and cargo transport runs during the Vietnam War era. This base was shut down and most American facilities were removed after U.S. established diplomatic relations with the China in 1979.

Answer:
3