INDIAN NAVY NAVY DAY December 04, Every year:   This day is celebrated as the Navy Day in India, to commemorate the start of Operation Trident during the Indo-Pakistani War of 1971. The one-night attack the Indian Navy sank three vessels near the largest Pakistani port of Karachi. Operation Trident resulted in first use of anti ship missiles in the region.In Vizag its a week long event showcasing warship, planes, tanks etc. at RK Beach.