Tub boats escort the USS Rainier through Port Townsend Bay on its way to docking at Naval Magazine Indian Island. The USS RAINIER is the third supply ship to bear the name of Mount Rainier, which is located in the state of Washington and is part of the Cascade mountain range. The mountain is a volcano born of fire and built up above the surrounding country by repeated eruptions and successive flows of lava. It is a relatively young volcano, only about one million years old. Mount Rainier is a 14,411 foot high volcanic peak along the west side of the Cascade Mountains. It is the fifth highest peak in the lower 48 states. On March 2, 1899 Mount Rainier became the fifth U.S. National Park.