The operation_sun_ring.zip file you have requested: Maps Levels Missions / Multiple Game Types / Battlefield Vietnam Operation Sun ring - 293.88kb is not available. Perhaps try browsing all files for the game Battlefield Vietnam and upload any files you want to share or are missing. This is the only information we could locate:
I haven't play this map myself but this is what i can say about it: Operation Sun Ring is a Battlefield: Vietnam map that takes place on a beach. Very small size map works with conquest, Custom Battle game types.