It was at FOB Warhorse, 2005, where I began with KBR as a ROWPU operator. I worked night shift for a while, by myself as there was only 3 of us at the time.
We had a generator conex converted into an office. I was inside the conex doing my water testing and I heard the sound of someone walking on the rocks, outside the conex. I figured that maybe it was security coming by to check on things. I went outside, and there was no one there and the sound stopped. The moon was bright that night and there was light shining on the rocks from it. I saw shadows of what looked to be spiked crescents zipping past my feet. I looked up and there was nothing flying around. These things were zipping real fast.
Later, I drove back to my LSA to get something. While I was backing up to park, someone starting banging on the truck. I stopped immediately thinking that I had hit someone. I got out and looked. No one there. This was about 4AM.
I went to the bag farm to take more samples and do a general check for water leaks. Between the last outermost bag and the Hescos there appeared a small light dancing around. I walked over to that area and it stopped.
When the new ROWPU site was completed, it was custom to get there before breakfast to start the generator, get the AC or heater working in the lab/office and set out a clipboard at the distribution point before walking across the road to the DEFAC for breakfast. As I left the office to go, I walked past the ROWPU conexes and I saw a man in a white tee shirt sitting on his heels leaned up against the conex. I started to go that way to see who it was and what he needed, but when I looked away and back again, he was gone, nowhere in sight.
Other people there have had similar experiences. I have never seen a ghost or UFO so I'm not one to readily believe in these things.