Battle of Midway
During the Battle of the Coral Sea one month earlier, the Japanese light carrier Shōhō had been sunk and the fleet carrier  had three bomb hits, and was in drydock undergoing repairs. Although the carrier  was undamaged, she had lost almost half her airplanes and was in port in Kure awaiting new planes and pilots. No new pilots were available because none had been trained. Flight instructors were used in an effort to make up the missing aircrew.