[Buckeye30]

Clint. When the 10th Sentai was re-organised in July 1941 it had the 70/74/76 Dokuritsu Chutai all with this marking ( based on the Nen river in NE China)-- in order white/yellow/red; from June 1943 the 70th/74th served as independent Chutai to the EOW. The Hollandia landings were in April 1944 so this Ki.51 is probably 70th Chutai as you say.
A Ki.46 "Dinah" from the 76th was also found in N. Guinea in 1944 with red insignia, also other Ki.51s with white.

Nick