Nuclear weapons and UFOs entered public life together in the late 1940s. The topic covers reports of unidentified objects over weapons plants, test ranges, missile fields and bomber bases, and the claim, advanced by researcher Robert Hastings and former missile officer Robert Salas, that the phenomenon watches nuclear arsenals and has sometimes interfered with them. The record shows that such reports exist and that some coincided with real security events, but not what was seen.

Early reports came from Hanford, Oak Ridge and New Mexico, where green fireballs seen from late 1948 prompted a multi-agency meeting that December. The best-known case is Montana's 1967 Malmstrom incident. A declassified unit history confirms that all ten Minuteman missiles of Echo Flight went off alert on March 16, 1967, and calls UFO rumors in the area disproven; Salas says that in the same weeks guards reported a glowing red object over his own launch facility, Oscar Flight, as its missiles dropped offline. Hastings's UFOs and Nukes (2008) gathered accounts from more than 160 veterans, and on September 27, 2010 he presented former Air Force personnel, Salas among them, at the National Press Club. In September 2026, Jesse Michels reunited the two former security policemen behind the 1977 Ellsworth AFB case.

Official sources offer narrower readings. The 2021 intelligence-community preliminary assessment said UAP sightings clustered around U.S. military training and testing grounds and judged that this may reflect "a collection bias" from denser sensors and reporting. The Wall Street Journal reported in June 2025 that the Malmstrom outage came from a classified Air Force test of missile vulnerability to electromagnetic pulse, an account Salas rejects. The 1971 U.S.–Soviet Accidents Measures Agreement is often cited, but its clause on unidentified objects seen by missile-warning systems covers detections that could risk nuclear war, not alien craft. AARO, which must report on UAP near nuclear assets, counted 50 drone incidents near nuclear infrastructure, weapons and launch sites in its fiscal 2025 report, up from 18, none reported as UAP.

A quantitative strand arrived in October 2025, when Stephen Bruehl and Beatriz Villarroel reported in Scientific Reports that transients on 1949–1957 Palomar sky-survey plates were about 45 percent more likely within a day of a nuclear test, while cautioning that this does not show cause. The stakes are high: if the strongest claims are true, they describe a vulnerability around strategic weapons, and if not, Malmstrom shows how nuclear secrecy can turn a security incident into a lasting public narrative.