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)?
Sentence (from "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).
Relevant evidence: Yes