Question: Vitim Airport is a public use airport built in Vitim, Sakha (Yakutia) Republic, Russia during World War II for the Alaska-Siberian (ALSIB) air route used to ferry which policy aircraft, formally titled "An Act to Promote the Defense of the United States?

full_context: Document 1: Lend-Lease: The Lend-Lease policy, formally titled "An Act to Promote the Defense of the United States", (Pub.L. 77–11 , , 55 Stat. 31 , enacted  11, 1941 ) was a program under which the United States supplied Free France, the United Kingdom, the Republic of China, and later the Soviet Union and other Allied nations with food, oil, and materiel between 1941 and August 1945. This included warships and warplanes, along with other weaponry. It was signed into law on March 11, 1941 and ended in September 1945. In general the aid was free, although some hardware, such as ships, were returned after the war. In return, the U.S. was given leases on army and naval bases in Allied territory during the war. Canada operated a similar smaller program under a different name.
Document 2: Northwest Staging Route: The Northwest Staging Route was a series of airstrips, airport and radio ranging stations built in Alberta, British Columbia, the Yukon and Alaska during World War II. It extended into the Soviet Union as the ALSIB (ALaska-SIBerian air road).
Document 3: Military history of Canada during World War II: The military history of Canada during the Second World War begins with the German invasion of Poland on 1 September 1939. While the Canadian Armed Forces were eventually active in nearly every theatre of war, most combat was centred in Italy, Northwestern Europe, and the North Atlantic. Over the course of the war, more than 1.1 million Canadians served in the Canadian Army, Royal Canadian Navy, Royal Canadian Air Force, and in forces across the Commonwealth. More than 44,000 lost their lives and 54,000 were wounded. The financial cost was $21.8 billion between 1939 and 1950. By the end of the war Canada had the world's fourth largest air force, and fifth largest navy. The Canadian Merchant Navy completed over 25,000 voyages across the Atlantic, 130,000 Allied pilots were trained in Canada in the British Commonwealth Air Training Plan. On D-Day, 6 June 1944 the 3rd Canadian Infantry Division landed on "Juno" beach in Normandy, in conjunction with allied forces. The Second World War had significant cultural, political and economic effects on Canada, including the conscription crisis in 1944 which affected unity between francophones and anglophones. The war effort strengthened the Canadian economy and furthered Canada's global position.
Document 4: HMS Willowherb (K283): During the first year and more after America entered the war against the Axis, the United States Navy suffered from an acute shortage of warships, particularly of antisubmarine warfare and escort types. To fill that need, an extensive ship construction and acquisition program was inaugurated. Part of that program consisted of placing orders with British and Canadian firms already tooled up to produce Flower-class corvette . Vitality" (PG-100) was such a ship. However, before she was launched on 15 April 1943 by the Midland Shipyard in Canada, she was traded to the Royal Navy under the terms of the lend-lease agreement for a similar ship being constructed in Canada. The British renamed her HMS "Willowherb, and she served in the Royal Navy for the duration of the war. On 11 June 1946, she was returned to the custody of the United States Navy. Though carried on the Navy list as PG-100 following the war, "Vitality" never actively served the United States Navy. She remained idle until sold on 7 May 1947. To whom she was sold and for what purpose is unknown, but one source indicates that she was not scrapped until 1961.
Document 5: Zyryanka West Airport: Zyryanka West Airport is an airport in Russia, located 8 km west of Zyryanka, Verkhnekolymsky District in the Sakha Republic of Russia. It was built during World War II for the Alaska-Siberian (ALSIB) air route used to ferry American Lend-Lease aircraft to the Eastern Front.
Document 6: British hydrogen bomb programme: The British hydrogen bomb programme was the ultimately successful British effort to develop hydrogen bombs between 1952 and 1958. During the early part of the Second World War, Britain had a nuclear weapons project, codenamed Tube Alloys. At the Quebec Conference in August 1943, the Prime Minister of the United Kingdom, Winston Churchill and the President of the United States, Franklin Roosevelt, signed the Quebec Agreement, which merged it with the American Manhattan Project, and many of Britain's top scientists participated in the British contribution to the Manhattan Project. The British government trusted that America would share nuclear technology, which it considered to be a joint discovery, but the United States Atomic Energy Act of 1946 (also known as the McMahon Act) ended technical cooperation. Fearing a resurgence of American isolationism, and Britain losing its great power status, the British government resumed its own development effort, which was codenamed "High Explosive Research".
Document 7: Kirensk Airport: Kirensk Airport (Russian: Аэропорт Киренск ) (IATA: KCK, ICAO: UIKK) is an airport in Irkutsk Oblast, Russia located 3 km west of Kirensk. It handles small transport aircraft. This airfield was part of the Yakutsk-Kirensk-Krasnoyarsk leg of the World War II Lend-Lease program Alaska-Siberian (ALSIB) air route.
Document 8: Mutual Defense Assistance Act: The Mutual Defense Assistance Act was a United States Act of Congress signed by President Harry S. Truman on 6 October 1949. For US Foreign policy, it was the first U.S. military foreign aid legislation of the Cold War era, and initially to Europe. The Act followed Truman's signing of the Economic Cooperation Act (the Marshall Plan), on April 3, 1948, which provided non-military, economic reconstruction and development aid to Europe. The Act was reauthorized in 1950 , but in 1951, it and the Economic Cooperation Act were succeeded by the Mutual Security Act, and its newly created independent agency, the Mutual Security Administration, to supervise all foreign aid programs, including both military assistance programs and non-military, economic assistance programs that bolstered the defense capability of U.S. allies.
Document 9: HMS Statice (K281): When the United States entered World War II at the end of 1941, the United States Navy found itself deficient in ocean escort-type vessels. A crash building program was instituted; but, to meet more immediate needs, the government contracted with shipbuilding firms in England and Canada to build Flower-class corvette . Vim" (PG-99) was one of those British-type escorts. She was launched on 1 April 1943 at the Collingwood Shipyard in Collingwood, Ontario. Nine days later, however, she was transferred to the Royal Navy under the terms of the lend-lease agreement in return for another Flower-class corvette then under construction in Canada. The British renamed her HMS "Statice, and she served the Royal Navy under the name through World War II. On 21 June 1946, she was returned to the United States Navy. Though carried on the Navy list as PG-99, the corvette never saw active service with the United States Navy. She was sold on 7 May 1947. To whom she was sold and to what purpose she was put is unknown.
Document 10: Chelyabinsk Shagol Airport: Chelyabinsk Shagol Airport (also Bakal) is an airfield in Russia located in the northwest part of Chelyabinsk. It was the first airport in Chelyabinsk, opened in 1938. Since 1953, all passenger traffic is handled by Chelyabinsk Balandino Airport, and Shagol Airport is used by the local pilots' training school, the Chelyabinsk Red Banner Military Aviation Institute of Navigators. In August 2007 it was used in military exercises of Shanghai Cooperation Organisation. It was a military bomber training base during the Cold War and had about 35 Tupolev Tu-134 UBLs based as recently as 1995. The airport can park over 40 aircraft. It is also used for air shows.
Document 11: Bodaybo Airport: Bodaybo Airport (IATA: ODO, ICAO: UIKB) is a regional airport built in Bodaybo, Irkutsk Oblast, Russia during World War II for the Alaska-Siberian (ALSIB) air route used to ferry American Lend-Lease aircraft to the Eastern Front.
Document 12: Vitim Airport: Vitim Airport is a public use airport built in Vitim, Sakha (Yakutia) Republic, Russia during World War II for the Alaska-Siberian (ALSIB) air route used to ferry American Lend-Lease aircraft to the Eastern Front.
Document 13: Krasnoyarsk Northeast: Krasnoyarsk Northeast was an air base in Russia located 4 km northeast of Krasnoyarsk. The airfield was the western end of the ALSIB Alaska-Siberia air route for Lend-Lease aircraft during World War II including Bell P-39 Airacobras and North American B-25 Mitchells. The former airfield has been converted into apartment complexes. There was an Antonov An-2 maintenance facility, which is now gone. It was a utilitarian airfield with An-2, An-24, and An-6 aircraft, probably now based at Krasnoyarsk Yemelyanovo Airport.
Document 14: ALSIB: ALSIB (or the Northern Trace) was the Soviet Union portion of the Alaska-Siberian air road receiving Lend-Lease aircraft from the Northwest Staging Route. Aircraft manufactured in the United States were flown over this route for World War II combat service on the Eastern Front.
Document 15: Marshall Plan: The Marshall Plan (officially the European Recovery Program, ERP) was an American initiative to aid Western Europe, in which the United States gave over $13 billion (approximately $132 billion in current dollar value as of September 2017) in economic support to help rebuild Western European economies after the end of World War II. The plan was in operation for four years beginning on April 8, 1948. The goals of the United States were to rebuild war-devastated regions, remove trade barriers, modernize industry, make Europe prosperous once more, and prevent the spread of communism. The Marshall Plan required a lessening of interstate barriers, a dropping of many regulations, and encouraged an increase in productivity, labour union membership, as well as the adoption of modern business procedures.
ground_truth: Lend-Lease