Extraterrestials have visited Earth

Ok essentially my role in this debate is to refute the claims of my opponent as this is more of a debate over the veracity of claims made about alien encounters. My one argument against this being likely at least in recent history is that there are few examples of serious cover ups working and those that we know about are rarely multinational. There are simply no examples of a global conspiracy to hide so much as a peanut working and so I have my doubts as to if a multinational coalition of governments could suppress findings about the truth of alien contact and prevent any of the private sector companies with the radar equipment that would be presumed to be able to detect any UFOs. 1. This appears to be based off of a single remark mentioned once by Donald K. Slayton, there is no corroboration for it Slayton doesn't even think it was an alien saying "I don"t automatically presume that it came from Alpha Centauri" NASA confirmed that there was a weather balloon in the area at the time. 2. Mitchell has confirmed he has never actually seen an extra terrestrial. He claims that there is a gigantic NASA conspiracy, the problem with this is of course there is only his word to back this up. The thing is that it's not as if NASA doesn't regularly leak. A wikileaks search for "NASA" [1] shows 22,592 results, now not all of them will be directly from NASA but fair amount of them will be. The thing is that not one of these leaked documents prove any of Mitchell's claims, something at would be expected if: a) Mitchell's conspiracy is true. b) It's open enough within the organisation for Mitchell to hear of it. As for the motive, likely narcissism. How many times have you really heard each appollo astronaut, I don't mean the first 3 to land on the moon but all the others? Despite their achievements most are relatively unknown. 3. This is a truly weird one, something happened but we don't know what although there are some much more down to earth things here. All we know is: a) Their was military helicopter flight that night (as described by the 3 witnesses to whatever happened, other witnesses on the ground and this is accepted by the military). b) The 3 then turned up with radiation like symptoms. c) Whatever happened severely traumatized all 3. d) They then made a court case that was thrown out for lack of evidence. However there are a number of explanations. For the first the illness couldn't have been radiation as the dose of radiation required to produce those symptoms reported would have been lethal [2]. Furthermore no cocktail of chemicals has been uncovered that would cause said symptoms. The symptoms are therefore likely psychosomatic and therefore not the result of radiation. As for what actually likely happened these scenarios are all possible, and all much more likely than an alien incursion covered up by the American government: A mirage, the location in which is happened is close to oil refineries which according to experts could have created a projection in the sky due to the flares given off by the refineries [3]. This in combination with the military helicopters flying around could have lead to the witnesses being traumatized after interpreting the events as something entirely different. A secret flight gone wrong. There were a number of aircraft being used at the time that could have been being tested or simply secret aircraft being flown, as it was far from any testing areas the most likely candidate is the Black Hawk helicopter that had entered service the previous year [4]. This would explain the flight. Something to note in all of these is that eye witness testimony is notoriously inaccurate, people remember what they think they saw rather than all of them. [1] https://search.wikileaks.org... [2] https://3.bp.blogspot.com... [3] http://www.blueblurrylines.com... [4] https://en.wikipedia.org...