The mysterious disappearance of a retired Air Force major general with deep expertise about UFOs who went missing without a trace Feb. 28 constitutes a “grave national security crisis,” according to an investigative journalist.

"Maybe the best hypothesis is that aliens beamed him up to the mothership," said the wife of Major General William Neil McCasland.

William Neil McCasland, a 68-year-old retired Air Force general and UFO expert, went missing from his New Mexico home on February 27 and hasn’t been seen since. Now, the Bernalillo County Sheriff’s Office has asked more than 600 residents in the neighborhood near McCasland’s home to hand over any security camera footage they have that may aid in finding the missing general.

The apparent disappearance of the mysterious disc has prompted online discussion about whether government entities are purposefully obscuring genuine alien-related imagery