Question: The Champaign Aviation Museum is an aviation museum in Urbana, Ohio, in which country, the museum and its volunteers are restoring a B-17 Flying Fortress back to flying status, a our-engine heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC)?

Context paragraphs:
B-17G &quot;Flying Fortress&quot; No. 44-83690: B-17G "Flying Fortress" No. 44-83690 is a historic B-17 Flying Fortress Heavy bomber located at the Aviation Museum, Grissom Air Force Base in Pipe Creek Township, Miami County, Indiana.  It was built by the Douglas Aircraft Company and delivered for use on May 9, 1945.  It was flown to Grissom Air Force Base for display as a museum piece in 1961, and subsequently restored.

B-17 Flying Fortress (video game): B-17 Flying Fortress or B-17 Flying Fortress World War II Bombers in Action is a flight simulation/role-playing video game released in 1992 for MS-DOS by MicroProse.  Amiga and Atari ST versions were released a year later.  The game simulates training, combat missions and sorties in a tour of duty in the Eighth Air Force of the United States Army Air Forces in the European Theater of Operations aboard a Boeing B-17 Flying Fortress bomber during World War II.

List of Boeing B-17 Flying Fortress variants: The following is an extensive catalogue of the variants and specific unique elements of each variant and/or design stage of the Boeing B-17 Flying Fortress heavy bomber.  For a broader article on the history of the B-17, see B-17 Flying Fortress.

Memphis Belle: A Story of a Flying Fortress: The Memphis Belle: A Story of a Flying Fortress is a 1944 documentary film which provides an account of the final mission of the crew of the "Memphis Belle", a Boeing B-17 Flying Fortress.  In May 1943 it became the first U.S. Army Air Forces heavy bomber to complete 25 missions over Europe and return to the United States.

United States Army Air Corps: The United States Army Air Corps (USAAC) was the military aviation arm of the United States of America between 1926 and 1941.  After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical rift developed between more traditional ground-based army personnel and those who felt that aircraft were being underutilized and that air operations were being stifled for political reasons unrelated to their effectiveness.  The USAAC was renamed from the earlier United States Army Air Service on 2 July 1926, and was part of the larger United States Army.  The Air Corps became the United States Army Air Forces (USAAF) on 20 June 1941, giving it greater autonomy from the Army's middle-level command structure.  During World War II, although not an administrative echelon, the Air Corps (AC) remained as one of the combat arms of the Army until 1947, when it was legally abolished by legislation establishing the Department of the Air Force.

Depienne Airfield: Depienne Airfield is a World War II airfield in Tunisia, located approximately 12 km northeast of El Fahs, and 53 km southwest of Tunis.  The airfield was first used by the German Luftwaffe in 1941 and 1942, and was captured by the British Army by a parachute attack on 3 December 1942.  It was later used by the United States Army Air Force Twelfth Air Force as a B-17 Flying Fortress heavy bomber airfield during the North African Campaign.

Enfidaville Airfield: Enfidaville Airfield is an abandoned World War II military airfield in Tunisia, located approximately 13 km north-northwest of Harqalah; approximately 90 km southwest of Tunis.  It was used by the United States Army Air Force Twelfth Air Force during the North African Campaign as a B-17 Flying Fortress heavy bomber ant troop carrier base.  Known units assigned were:

List of surviving Boeing B-17 Flying Fortresses: The Boeing B-17 Flying Fortress is a four-engine heavy bomber aircraft primarily employed by the United States Army Air Forces (USAAF) during World War II.  Developed by Boeing, a total of 12,731 aircraft had been produced by Boeing, Douglas and Lockheed from 1936 until 1945.  Over 8,000 were lost in either combat operations or training accidents.  The remaining combat veterans and early production models were stored and later scrapped in the vast scrap drives of the late 1940s, many going to aircraft boneyards like Davis-Monthan Air Force Base in Tucson, Arizona, the largest of its kind within the United States' borders.

Champaign Aviation Museum: The Champaign Aviation Museum is an aviation museum in Urbana, Ohio, United States.  The museum and its volunteers are restoring a B-17 Flying Fortress back to flying status.

Boeing B-17 Flying Fortress: The Boeing B-17 Flying Fortress is a four-engine heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC).  Competing against Douglas and Martin for a contract to build 200 bombers, the Boeing entry (prototype Model 299/XB-17) outperformed both competitors and exceeded the air corps' performance specifications.  Although Boeing lost the contract (to the Douglas B-18 Bolo) because the prototype crashed, the air corps ordered 13 more B-17s for further evaluation.  From its introduction in 1938, the B-17 Flying Fortress evolved through numerous design advances, becoming the third-most produced bomber of all time, behind the B-24 and the multirole Ju 88.

Supporting paragraphs: Champaign Aviation Museum Boeing B-17 Flying Fortress
Answer: United States