Question: The Vintage Ultralight SR-1 Hornet is produced by the Vintage Ultralight and Lightplane Association located in what county?
Context: The Chotia Woodhopper is an American ultralight aircraft that was designed by John Chotia and made available in the form of plans for amateur construction.  The plans remain available from the Vintage Ultralight and Lightplane Association. The Vintage Ultralight SR-1 Hornet is an American homebuilt aircraft produced by the Vintage Ultralight and Lightplane Association of Marietta, Georgia, introduced in the early 1980s.  The aircraft is supplied in the form of plans for amateur construction. Letov LK-2 Sluka is a Czech single-seat high-wing ultralight aircraft produced by the Letov aircraft factory in 1990s and later as a kitbuilt or custom production using tools and material which remained after the closing of the factory production.  Sluka is a simple, cheap and easy to fly aircraft which contributed to a rapid growth of ultralight flying organized by then established Light Aircraft Association (LAA - Letecká amatérská asociace) in the Czech Republic.  Its main purpose is a local hobby flying and a flight training as a complement to twin seat elementary trainers like Letov LK-3 and ST-4 or TL-32 Typhoon.  Sluka does not offer any advanced training possibilities in respect of performance, speed, ceiling or aerobatics compared to the mentioned twin seat models but its purchase price and cost per flight hour are lower. Marietta is located in central Cobb County, Georgia, United States, and is the county's seat and largest city. Chinook Ultralight Airpark (FAA LID: 52OR) is a private Ultralight Flightpark located 3 miles east of Scappoose in Columbia County, Oregon, USA. The Aerotique Parasol is an American parasol-wing, strut-braced, conventional landing gear, single-seat, open cockpit, single engine in tractor configuration, ultralight aircraft that was designed as an ultralight version of the 1926 vintage Heath Parasol.  It was originally produced by Yesteryear Aviation and later by Aerotique Aviation.  The aircraft was supplied as factory-built only. The Mathews Mr Easy is an American homebuilt aircraft that was designed by Lyle Mathews and associates and produced by the Vintage Ultralight and Lightplane Association of Marietta, Georgia.  It was the sixth and final design of Mathews.  The aircraft is supplied in the form of plans for amateur construction. Epcot Center Ultralight Flightpark (FAA LID: 44FD) was a private-use ultralight airport located in Osceola County, 13 nautical miles (24 km) northwest of the central business district of Lake Buena Vista, Florida, United States.  It was privately owned by the Walt Disney World Company, and was used to launch aircraft used in the "Skylaidescope" and "Surprise in the Skys" shows at the Epcot theme park. Rocky Hill Ultralight Flightpark (FAA LID: 48P) is a public use ultralight airport located one nautical mile (1.85 km) southeast of the central business district of Cresco, a town in Monroe County, Pennsylvania, United States. The Hovey Whing Ding is an extremely minimalist American ultralight aircraft that was designed by Bob Hovey of Saugus, California, first flying in 1971.  The aircraft is supplied in the form of plans for amateur construction by the Vintage Ultralight and Lightplane Association of Marietta, Georgia.
Answer: Cobb County