To all naval aviation personnel instant recognition of aircraft--friend and enemy--is a matter of life and death. Recognition is doubly important to the pilot, whose reaction must be measured in fleeting moments. To sharpen that recognition, aviation cadets spend long, hard hours learning the points of recognition of all types of airplanes. There must be no fatal confusion between the similar P-38 and the FW-189--between a Mitsubishi and an Allied bomber.