I also liked Unknown Soldier. It was a weird crossover, but there was another occult-tinged war comic called G.I. Combat which featured the crew of a haunted American tank. The tank was aided by the ghost of confederate General Jeb Stuart from the Civil War.

The only crewman who could see and hear the ghost was their commander, who was also named Jeb. I never knew why the good general helped the tank, other than the model of machine was known as an M3 Stuart tank, which was named after him, but apparently the ghost of Alexandr the Great sent him to help the tankers while they were fighting in North Africa. I guess that makes as much sense as the origin stories of any other comic book character.

C.X.