"Experiment with converging or diverging boresight patterns on AA weapons," Capt. Handly subsequently recommended to the fleet. "Make similar research with range setting and deflection devices. Try the elimination of all tracer and all 5-inch except Mark 32 or similar marks to deny pilot the knowledge of where the AA is and relieve gunners of the confusion of many bursts which tend to hide the plane, particularly at twilight. Tracers did not appear to assist our own gunners, and many guns apparently fired at 5-inch bursts."