From the US Army official book on Okinawa (see
https://history.army.mil/books/wwii/...chapter4.htm):
"Enemy air opposition had been relatively light during the first few days after the landings. On 6 April [1945] the expected air reaction materialized with a fierce attack of 400 planes which had flown down from Kyushu to drive the invaders from Okinawa. The raids' began at dawn, and by noon Task Force 58 had shot down seven possible suicide planes. Throughout the afternoon the battle increased in intensity. Patrol and picket ships, which throughout the operation proved an irresistible attraction to enemy planes, were a favorite target. Japanese planes also appeared from time to time over the Hagushi beaches and transport area and were taken under fire by the ship and shore batteries. On such occasions the raider, ringed with bright streams of tracer bullets from automatic weapons, would streak across a sky filled with black puffs of smoke from hundreds of bursting shells, and in the course of seconds would plunge into the sea in a geyser of water and smoke, or crash into a ship with an even greater explosion of smoke and flame.
Directed against such raiders, friendly fire killed four Americans and wounded thirty-four others in the XXIV Corps zone, ignited an ammunition dump near Kadena, destroyed an oil barge, and in the late afternoon shot down two American planes over the beaches. Some ships also suffered damage and casualties from friendly fire. Twenty-two of twenty-four suicide crashes were successful, sinking two destroyers, a mine sweeper, two ammunition ships, and an LST. A ship rescuing survivors from the lost LST was itself struck by a suicide plane soon after but was not seriously damaged. The attack cost the Japanese about 300 planes; 65 were splashed by fliers from the Essex alone. Unloading continued on the Hagushi beaches almost without pause, and the American fleet, although it had taken severe blows, was still intact."
According to
http://www.aviationarchaeology.com/src/USN/LLApr45.htm, the US Navy lost 19 aircraft in Okinawa area on this date so identifying the two victims of friendly fire would need a check of USN war diaries, and my fold3 account is down for the moment.