The stories coming from military and law enforcement are always interesting as these are people who are trained to log and report cold hard facts.
In Afghanistan there is a region called the Helmand Province that is basically just a bunch of hills and bushes but also a strategic bunch of hills and bushes. Military forces have been fighting in that area for decades, most recently US and British forces held the area but before that it was Taliban forces preceded by Russian military preceded by Mujahedeen and I'm sure many people before then. I know that recent US and British forces would send small teams out to a particular hill for 6-8 weeks at a time who had weird experiences which had to be reported. Some was mundane such as they could setup sandbags for protection but not dig too deep as there were human remains and other artifacts in the sand. Also, apparently many soldiers had terrible nightmares and felt ill while at the location. Others reported hearing footsteps and whispers or seeing shadowy figures running around which didn't show up on either nightvision or thermal imaging.
More seriously were reports of static coming over the radio with voices speaking in foreign languages, such as Russian. Modern military radios are encrypted and utilize frequency hopping technology which means it's impossible to get radio interference from another source unless that source has the exact same frequency pattern and decryption codes. There was also reports of the sounds of gunfire, yelling and explosions but with no obvious source. So the soldiers would wake up to gunfire but not see where it was coming from and could find no trace of a firefight afterwards such as bullet holes, spent casings or even footprints in the sand.
I'm sure these type of incidents are most likely filed away as being caused by "Battle Fatigue" or "Shell Shock" which are the euphemisms for PTSD.