Warfare History Network,
In addition to standard aircraft carrier and warship patrol operations in the open sea, naval action during the Vietnam War developed a character of its own. While the U.S. Navy maintained responsibility for more traditional functions, the interior waterways of Vietnam became an area of operations that required a different approach.
Since the early 20-century, the patrol workhorse of the U.S. Navy had been the destroyer, which rose to prominence during the two world wars. Destroyers provided perimeter security for formations of surface ships, anti-submarine and antiaircraft defenses, and search-and-rescue duties among others. These warships rendered invaluable service; however, during the Vietnam War the ocean-going vessels were unsuited for operations along the deltas, coastal areas, and rivers of the country.