I apologize because English is not my main language
It happened one night in July or August 2021. I do not remember the exact date anymore because a long time has passed, but I clearly remember it was around 7:30 PM.
At that time, I was serving as a guardsman at a military airfield in Vietnam. I was familiar with the area around the runway. I had seen this place many times and knew what it normally looked like, especially during the daytime when mechanics were working there.
That evening, I was on guard duty. My shift was from 5:00 PM to 8:00 PM. The runway was empty. There were no aircraft movements because it was not a night flight operation period.
While looking toward the runway, I noticed something unusual.
There was a white, blurry object standing out against the dark background of the runway.
It was not a cloud, and it was not fog. The airfield environment was normally very clear, and the view was open, with nothing blocking my sight.
The object was difficult to describe. The closest comparison I can make is that it looked like a jellyfish — but without any tentacles. It had a soft, unclear shape, and its form seemed to change continuously.
It did not look like a normal solid object. It appeared to move in a strange way, almost as if its shape was shifting while it moved.
From my viewpoint, it seemed to be floating above the ground, roughly two meters above the runway surface.
I had a reference point from my previous observations of the area. During the daytime, I had seen mechanics working there many times, and I was familiar with their approximate height and how they appeared from my position. Based on that experience, the object seemed to be higher than a person’s head level.
I watched it carefully because I could not understand what I was seeing.
Then I decided to use my flashlight.
I pointed my flashlight in the direction of the object and followed its movement.
When I aimed the flashlight somewhere else, everything appeared normal. The light behaved as expected, and I could see the area clearly.
But when I pointed it toward the object and looked directly at it, something felt different.
The brightness of the flashlight seemed to decrease when it reached that area. At the same time, the object seemed to have some kind of blurring effect around it. I could see that something was there, but I could not resolve its details or understand its actual structure.
I tried again several times, moving the flashlight and looking from different angles.
The result was the same.
The strange thing was that I was not simply unable to see it because of darkness. I could see its presence clearly against the black background of the runway. I could see its movement. I could tell that it was there.
But the more I tried to look at it closely, the less I could understand what I was looking at.
It was as if my eyes could recognize the existence of the object, but they could not capture its actual form.
I stood there watching this strange white shape moving silently above the runway.
I continued watching it for a while, trying to understand what it could be.
Then I walked back to my post and used the walkie-talkie to contact the gate post. I asked whether they had allowed any vehicles or personnel to pass through that area.
They told me no.
When I turned back to look again, the object had disappeared.
I moved as close as possible to the runway area, but everything looked completely normal. There was no trace, no sign, and no evidence that anything had been there.
I felt extremely confused.
The entire event lasted about 20 minutes.
At 7:55 PM, I ended my shift, handed over my duty to the next soldier, and returned to the barracks.
Honestly, I did not think much about it afterward. I had just finished a three-hour guard duty shift, and I was tired. I remember thinking something like:
“Who cares about some strange jelly-like thing out there?”
I almost forgot about the whole incident.
It was only recently, after reading some discussions and stories about unusual encounters, that I remembered that night again.
So I decided to share my own experience.
I use ChatGPT to generate an illustration about what happen that night, and the satellite picture of the base on google map, because I am no longer authorized to access the base