Sigint talks about that if you call when you first see them. My favourite is when you call Sigint about the guard dogs. I think that story is legit too.

The Soviets tried to train dogs to run under German tanks with explosives strapped to them, making them literal anti-tank fur missiles. But when they made their debut in combat they ran to and detonated under Soviet tanks. When they were training the dogs they used Soviet tank hulls for practice. Soviet tanks used diesel fuel so that’s the smell the dogs sought out. Then project was suddenly scrapped!