there are 2 different ways to play this map
XhAOS_ISLAND is a normal US vs Japan pacific type map (but with some german vehicles for the japanese)

XhAOS_ISLAND_xv has some modified vehicles, it is not supposed to be realistic or anything.
so no whining!

extract both RFA to your [battlefield 1942 game folder]/mods/bf1942/archives/bf1942/levels

you need XhAOS_ISLAND_xv.RFA for XhAOS_ISLAND.RFA to work. it references the textures and heightmap from that one so the download could be kept smaller.

there is a "no fly zone" over the hospitals so if you fly too low over them your plane will mysteriously explode 

have fun! :)