One of the most photographed exhibits in the International UFO Museum and Research Center at Roswell is the alien autopsy room.
Based on the 1947 crash near Roswell, eyewitnesses told of how the United States Air Force removed what appeared to be a body from the crash site. Naturally, any alien bodies recovered would have been, you know, cut open to examine their physiology.
In other words, an autopsy would have been performed. Given the era and the circumstances, this is how the scene would have likely appeared.
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