This is a very interesting photo from the Japanese side showing the ground-use of air weapons.
The US recovered such ground installations of the IJN's Type 99 20mm MG in the Marshall and Mariana Islands.
Both the Mk.1, Mk.2, flexible & fixed mount types.
https://t.co/XkFNjrLibz https://t.co/BvFazycNRC https://t.co/C7n8LYoSxf
This "modified type 97 tank MG" probably came from the type 2 Ka-Mi amphibious tank destroyed or captured on Saipan, according to this https://t.co/fHNDuDnN4y document.
Type 2 Ka-Mi does have a coaxial Type 97 MG I think?(Pardon for using English...) https://t.co/RnonULlV89