The Kyushu K10W Type 2 land-based intermediate trainer (Allied reporting name Oak) was a single engine, low wing fixed undercarriage monoplane training aircraft which served in the Imperial Japanese Navy Air Service in the latter part of World War II.

However, a close study of the "Oak", as it was code named by the Allies, shows that they shared nothing beyond a similar configuration.

[1] Whereas the NA-16's featured a steel tube structure covered with metal or fabric panels, the K10W1 was of flush riveted stressed skin construction throughout (excepting the fabric covered control surfaces) with a slightly smaller wingspan, narrower chord wings, a longer fuselage, and a higher aspect ratio tailplane.

[2] The K10W1 was not popular with crews, possibly due to ongoing handling problems, and only served with a small number of units, which included the Oi, Go, Takarazuka, and 81st Kokutais (Naval Air Groups) as trainers.

Japanese records do not show that any were used for Kamikaze attacks, although a small number were definitely used as target tugs for gunnery training and as unit hacks attached to operational bases, where they probably assisted in getting new pilots up to speed.