The Bat was a conventional radar guided glide bomb. It is a viewed as an ancestor of current anti-ship missiles."http://biomicro.sdstate.edu/pederses/asmbat.html"ASM-N-2 BAT
On January 12, 1942, Dr. Adams sent to the White House a proposal to investigate the possible use of bats as bombers. In those days, well-meaning citizens were proposing all kinds of warfare ideas, most of them impractical. However, this idea, after being sifted through a top-level scientific review, became one of the very few given the green light. It was passed to the Army Chemical Warfare Service (CWS) for further inquiry in conjunction with Army Air Forces. The official CWS history states simply: "President Roosevelt OK'd it and the project was on."