Huntsville is the seat of Madison County in northern Alabama, a city of 215,006 people at the 2020 census and an estimated 233,627 by 2025. Known as the "Rocket City," it is organized around Redstone Arsenal, the Army post that hosts NASA's Marshall Space Flight Center along with many Army and defense agencies, and around Cummings Research Park, described as the second-largest research park of its type in the country.

Huntsville dates to 1805, when settler John Hunt arrived, and was incorporated in 1811. Its modern identity began in 1941, when the Army acquired about 35,000 acres for chemical munitions plants. After World War II the site became Redstone Arsenal, a rocket and missile center, and in 1950 about 1,000 personnel moved there from Fort Bliss, Texas, including roughly 200 German scientists led by Wernher von Braun. NASA opened Marshall on July 1, 1960, with von Braun as its first director. On September 2, 2025, President Trump announced that the headquarters of U.S. Space Command would move to Huntsville from Colorado.

Huntsville's place in UFO discussion comes less from sightings than from researchers working near that aerospace base. In the 1990s, University of Alabama in Huntsville physicist Ning Li proposed that rotating superconductors could produce gravity-like effects, then founded AC Gravity, which received a Defense Department grant in 2001. Online theories that she vanished into secret work were later answered by her son's account; she passed away in 2021. Amy Eskridge, a Huntsville researcher who pursued gravity-modification concepts with her father, retired NASA physicist Richard Eskridge, died in the city on June 11, 2022; her death was ruled a suicide. Lue Elizondo said in 2026 that she had briefed him and colleagues on an anti-gravity project in Huntsville in 2019, that he could not judge its legitimacy, and that she said she feared for her life.

In 2026 Eskridge's case and the 2025 death of a young NASA engineer near Huntsville were added to online lists of missing and dead scientists. House Oversight leaders James Comer and Eric Burlison asked four agencies on April 20, 2026, for briefings on reports of at least ten such cases, though their letters did not name the Huntsville deaths and no public finding has linked them. Huntsville's significance is that its concentration of rocket, missile, and space engineering makes it a recurring backdrop for claims about advanced propulsion and the people who study it.