Many years ago (Cold War), most flying squadrons and stations ran on ops boards generously coated with Chinagraph. All the information was tracked that way, crew and aircraft status, progress through training serials, tasking, flypros, weather etc. I observed to a colleague that all the Sovs needed to do to ensure victory was to develop a bomb that would erase Chinagraph, denying us all our normal information. And if they wanted to be doubly sure, arriving at 1800 on a Friday would also help!