We taught mostly by slides that would project a very small image on a screen. In a matter of a tenth of a second the pilots had to discern whether the flash was a Japanese plane, an American plane, or a British one. They further had to tell whether it was a bomber, a fighter, or another type plane. . . . They also had to be able to distinguish ships . . . and finally they had to study and be able to identify submarines and Japanese Merchant Shipping Tonnage. . . .
