Maybe the Mighty Mo, for the the Missouri River, is more prominent than the Mighty Mississippi, for the Missouri is the longest river in the USA, stretching for about 2341 miles.  The Mighty Mo is also the battleship USS Missouri, where the Japanese officially signed in Tokyo Bay the ending of World War II.  This Mighty Mo is now permanently docked in Pearl Harbor, serving as a museum.  About this Mighty Mo: Commissioned in 1944, making it 84 years old. Could move at a top speed of 38 MPH. Served in WWII, Korean War and Persian Gulf War. There are nine main guns, firing 16-inch projectiles up to 24 miles, and was upgraded to Tomahawk cruise and Harpon anti-ship missiles in 1980, increasing the range to 800 miles. Decommissioned in 1992, as were all American battleships. There are still active destroyers and cruisers with a striking range of 1000 miles.  Aircraft carrier planes such as the Super Hornet, can hit a target 575 miles away, but with long-range missiles. Ca...