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Zone Troopers (1985)
(feddit.nl)
THEY TAKE WAR TO A NEW DIMENSION.
During World War II, a group of American soldiers gets trapped behind enemy lines in Italy. They encounter an alien spaceship and its surviving passenger, leading to a pursuit involving both Nazi forces and additional extraterrestrial entities aiming to rescue their comrade.
I finally saw The Keep last year. A bit slow at points but generally... awesome.