4 June 1942:
The convoy is contacted by PBY P-12; one of eleven VP-44 launched from Midway that morning on a search/strike mission. CHITOSE launches three two-seat "Pete" fighter float biplanes to intercept the flying boat. They engage P-12 at 500 feet and shoot it down into the sea. Lt (j.g.) Robert Whitman and four of his ten-man aircrew are lost. [3]
4 October 1942:
CHITOSE's PO (later WO) Katsuki Kiyomi, flying combat air patrol over the fleet in a F1M2 Pete, spots four enemy fighters and five B-17s. To prevent the bombers from hitting the seaplane carrier NISSHIN, Katsuki dives on the leading B-17E of the 72nd Bomb Squadron. He rams the bomber from below, tearing the right main wing and the vertical stabilizer off the B-17 and damaging the Pete's right wing. Katsuki and his observer bale out. Destroyer AKITSUKI rescues both. The B-17's crew is lost. [4]