Special Platoon Commander by Vadim Sharapov

In addition to the well-known World War II there was a secret, unknown war. A war in which humans and their allies opposed supernatural threats. UK and US got their MI-6 and Office of Strategic Services. Nazis got Ahnenerbe and Heilige Lanze, Lance of Longinius. And Soviets got SMERSH assault battalions... and the Special Platoons, the last line of defense against those who lurks in darkness.