It is perhaps best known as a term used during World War II by the military of the Empire of Japan , for Imperial Japanese Army Air Service ( IJAAS ) and Imperial Japanese Navy Air Service ( IJNAS ) military aviation units equivalent to a group or wing in other air forces .
It is a term used during World War II by the military of the Empire of Japan . Imperial Japanese Army ( IJA ) and Imperial Japanese Navy ( IJN ) Air Service sentai units were equivalent to a group or wing in other air forces .