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.
Q: Question: Which countries signed the Warsaw Pact? Passage 1:Through the Cold War, the United States, Soviet Union and other countries contemplated the possibility of nuclear warfare. While previous technology had developed to protect the crews of armored vehicles from projectiles and from explosive damage; the possibility of radiation arose. In the NATO countries little if any development took place on defining a doctrine of how to use armed forces without the use of tactical nuclear weapons. In the Soviet sphere of influence the legacy doctrine of operational maneuver was being theoretically examined to understand how a tank-led force could be used even with the threat of limited use of nuclear weapons on prospective European battlefields. The Warsaw Pact arrived at the solution of maneuver warfare while massively increasing the number of anti-tank weapons. To achieve this, Soviet military theorists such as Vasily Sokolovsky (1897-1968) realized that anti-tank weapons had to assume an offensive role rather than the traditionally defensive role of the Great Patriotic War (1941-1945) by becoming more mobile. This led to the development of improved guided anti-tank missiles, though similar design work was being performed in Western Europe and the United States.
 Passage 2:Due to his actions during the battle, former Army Captain William D. Swenson was recommended to receive the Medal of Honor by Marine General John R. Allen. Having been critical of the officers superior to him during the battle, he left the Army in February 2011. A 2012 investigation by McClatchy News Service concluded that the justification for Meyer's decoration may have been inflated and that the nomination for Swenson's Medal of Honor may have been intentionally lost. Meyer disputes McClatchy's allegations in his book, Into the Fire: A Firsthand Account of the Most Extraordinary Battle in the Afghan War. In August 2012, California Representative Duncan D. Hunter wrote to Secretary of Defense Leon Panetta regarding the Medal of Honor nomination of Swenson, comparing his case to that of Sgt. Rafael Peralta. In January 2013, Representative Hunter said Swenson's nomination had been awaiting President Barack Obama's approval at the White House since at least July 2012. Representative Hunter stated he was considering seeking an inspector general inquiry due to the delay. Swenson was awarded the Medal of Honor on October 15, 2013.
 Passage 3:Huitema made her first junior appearance for Canada with the national under-15 team on August 7, 2014 against Puerto Rico in a 5–0 victory at the CONCACAF Girls Under-15 Championship. The Canadians would go on to win the inaugural edition of the tournament in a penalty shoot-out, with Huitema scoring the winning shoot-out goal. She would go on to make 10 more appearances for the under-15 squad. Huitema's debut for the under-17 team came on March 3, 2016 at the CONCACAF Women's Under-17 Championship in a 3–0 win against Guatemala. Huitema played in the 2016 FIFA U-17 Women's World Cup. There, she scored her first goal in FIFA competition in a 3–2 win over Cameroon. She made 7 more appearances for the under-17 team. On July 6, 2017, Huitema made her first appearance for the under-20 team, scoring a goal in a 4–1 win over the United States. After scoring in a 3–1 loss to China in an under 17 match on July 12, 2017, Huitema became the first Canadian to score for the under 17, under 20 and senior national team in the same calendar year. In 2017, she was named the Canada U17 Female Player of the Year for her performances with the U-17, U-20 and senior teams throughout the year. On January 12, 2018, Huitema was named to Canada's squad for the 2018 CONCACAF Women's U-20 Championship in Trinidad & Tobago. In the first game of the tournament, Huitema scored twice in a 3–1 win over Costa Rica. In the second game, Huitema scored a hat-trick in a 4–1 win over hosts Trinidad & Tobago, which clinched Canada's progress into the semi-finals. She would play 66 minutes in a 4–0 victory over Haiti which resulted in Canada winning their group. In the semi-finals against Mexico, Huitema played the full game in a 1–1 draw. Canada would lose the match 4–3 on penalty kicks in which Huitema saw her attempt saved. Canada would require a win over Haiti in the third place match to qualify for the FIFA U-20 Women's World Cup in France later in the year. Canada would lose the match by a score of 1–0 and fail to qualify for the U-20 World Cup. Huitema was the tournament's top scorer with five goals and was named to the Best XI of the championship.

A:
1