The operation_overlord.zip file you have requested: Maps Levels Missions / Conquest Maps / O to P Titles / Operation Overlord - 16.89mb 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:
June 6, 1944. Sixty years ago the tide of war was turned by the invasion of Normandy. Just extract the file into your map directory. Best played with lots of people.