Again, you're literally talking about people telling stories with zero supporting evidence. Most of the claims of that happening are third-hand and are largely based off the fact that nukes went off-line all the time (at any given moment, 30-40% of nuclear missiles were not working). How would this even be proof of extraterrestrials - how do you know the beings "deactivating nuclear weapons" weren't time-travelers, angels, demons, or whatever?
The best evidence you have of aliens is flares being dropped on a military base.
Again, a quick copy-paste:
According to Sheaffer, what became known as "the Phoenix Lights" incident of 1997 "consists of two unrelated incidents, although both were the result of activities of the same organization: Operation Snowbird, a pilot training program operated in the winter by the Air National Guard, out of Davis-Monthan Air Force Base in Tucson, Arizona."[9] Tucson astronomer and retired Air Force pilot James McGaha said he also investigated the two separate sightings and traced them both to A-10 Thunderbolt II aircraft flying in formation at high altitude.[10]
The first incident, often perceived as a large “flying triangle” by witnesses, began at approximately 8:00 pm, and was due to five A-10 jets from Operation Snowbird following an assigned air traffic corridor and flying under visual flight rules. Federal Aviation Administration (FAA) rules concerning private and commercial aircraft do not apply to military aircraft, so the A-10 formation displayed steady formation lights rather than blinking collision lights. The formation flew over Phoenix and on to Tucson, landing at Davis-Monthan AFB about 8:45 pm.[9]
The second incident, described as "a row of brilliant lights hovering in the sky, or slowly fallings" began at approximately 10:00 pm, and was due to a flare drop exercise by different A-10 jets from the Maryland Air National Guard, also operating out of Davis-Monthan AFB as part of from Operation Snowbird.[9] The U.S. Air Force explained the exercise as utilizing slow-falling, long-burning LUU-2B/B illumination flares dropped by a flight of four A-10 aircraft on a training exercise at the Barry M. Goldwater Air Force Range in western Pima County, Arizona. The flares would have been visible in Phoenix and appeared to hover due to rising heat from the burning flares creating a "balloon" effect on their parachutes, which slowed the descent.[11] The lights then appeared to wink out as they fell behind the Sierra Estrella mountain range to the southwest of Phoenix.
A Maryland ANG pilot, Lt. Col. Ed Jones, responding to a March 2007 media query, confirmed that he had flown one of the aircraft in the formation that dropped flares on the night in question.[11] The squadron to which he belonged was at Davis-Monthan AFB on a training exercise at the time, and flew training sorties to the Goldwater Air Force Range on the night in question, according to the Maryland ANG. A history of the Maryland ANG published in 2000 asserted that the squadron, the 104th Fighter Squadron, was responsible for the incident.[12] The first reports that members of the Maryland ANG were responsible for the incident were published in The Arizona Republic in July 1997.[13]
Later comparisons with known military flare drops were reported on local television stations, showing similarities between the known military flare drops and the Phoenix Lights.[5] An analysis of the luminosity of LUU-2B/B illumination flares, the type which would have been in use by A-10 aircraft at the time, determined that the luminosity of such flares at a range of approximately 50–70 miles (80–113 km) would fall well within the range of the lights viewed from Phoenix.[14]
During the Phoenix event, numerous still photographs and videotapes were made showing a series of lights appearing at a regular interval, remaining illuminated for several moments, and then going out. The images were later determined to be the result of mountains not visible by night that partially obstructed the view of aircraft flares from certain angles to create the illusion of an arc of lights appearing and disappearing one by one.[15][14]
That's the best evidence for extraterrestrials that you know.