The Pakistan Navy was formed in 1947 by the Indian Muslim officers serving in the Royal Indian Navy. The prefix "Royal" was soon added but dropped in 1956 when Pakistan became an Islamic republic. Its prime responsibility is to provide protection of nation's sea ports, marine borders, approximately 1,000 km (650 mi) of coastline, and supporting national security and peacekeeping missions. With approximately 71 commissioned warships and 36,000 active duty personnel, its operational scope has expanded to greater national and international responsibility in countering the threat of sea-based global terrorism, drug smuggling, and trafficking issues.