India observes Navy Day on December 4th annually, acknowledging the significant achievements and contributions of the Indian Navy to the nation. The date holds historical importance as, on December 4, 1971, during Operation Trident, the Indian Navy successfully sank four Pakistani vessels, including PNS Khaibar, resulting in the loss of numerous Pakistani Navy personnel. This day also serves as a remembrance for those who lost their lives in the Indo-Pakistan War of 1971.