The Roswell Army Ghosts  are ghosts of army soldiers twisted by the thoughts of aliens.
In 1947, several soldiers stationed at the Roswell Army Air Field took care of whatever crash landed in the vicinity of the base in what became known as the "Roswell Incident." In death, they were haunted by what they were haunted by in life - aliens. Their manifestations were twisted to match this single overriding thought. For an unknown reason, their territoriality stretched miles from the alleged UFO crash site.
Many decades later, sightings of these ghostly little green men increased along with a new report that they had become more aggressive and forceful. The governor of New Mexico called in the Ghostbusters to investigate. But after a couple days of investigation, they only turned up erratic P.K.E. readings. As they clashed with two FBI agents over jurisdiction, the ghosts manifested and kept uttering "Restricted." Special Agent Jim Savage communicated with the ghosts but they in turn attacked him then vanished. Thanks to Kylie Griffin, Ray Stantz realized the ghosts were masking themselves. Ray played off a hunch and confronted the ghosts with the truth. The ghosts were confused and temporarily reverted to their true forms. The Ghostbusters quickly trapped them.
The Roswell Army Ghosts give off P.K.E. readings indicative of a standard ghost. 
The ghosts can shape shift and fly. When they attack their victims, they leave some slime and wounds that look like human bite marks.
- One of the soldier ghosts appears to be visually based on Big Ben, a zombie soldier from the 1986 movie "House"
- On the Convention Cover of Ghostbusters: Get Real Issue #1, the Roswell Army Ghosts makes a cameo left of Ray Stantz' Particle Thrower.
- ↑ Dapperpomade Tweet 10/2/15
- ↑ Winston Zeddemore (2012). IDW Comics- "Ghostbusters Issue #11" (2012) (Comic p.11). Winston says: "The docs said they found some slime in the man's cuts. I scanned some and it's standard issue, nothing alien."