Here is another number 13 you might want to do later. I found a small picture of the artwork I can send later if interested.
Bill
P-61 A-10 42-5619 SATAN 13, crewed by Capt John Pemberton, R/O Fit Off C W Phillips and Engineer P D Curran. 426th NFS, Kunming, China, late 1944
This aircraft was just one of many A-models completed without a top turret. The oval housing on the spine of the aircraft contained the ADF aerial, this radio directional finding equipment being unique to P-61s in the Pacific and CBI. ADF proved to be critical in both theatres, as crews would often return from long patrols with little fuel reserves and needing precision guidance back to base.