Just to add something on the matter of the use of IR in wartime.
A friend of mine had a few original copies of proposal documents liberated from the drawing office of G.A.L post war and one was for an assault glider. What was noticeable was that the specification specifically detailed that the instruments were to use IR reflective markings to be illuminated by and IR lamp in the cockpit and the cockpit interior painted matt black.
My interpretation is that this was to allow them to fly with the cockpit in total darkness as no visible lights shone but that the pilots would wear some sort of goggles that allowed them to read the dials. One wonders if this would also allowed them to see IR emitting formation lights fitted to the tug as well.