The blackdragon_base.zip file you have requested: Maps Levels Missions / Conquest Maps / A to B Titles / Attack on BlackDragon Base - 7.18mb 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:
Multiplayer Map composed of an airfield, ruins, US, NVA Base, a supply depot and a fishing village. Zip includes a read-me, the map and three screenshots.