The Liberty Ship was a cargo ship made to a standard for rapid construction during WW2. The US made 2751 such ships during the war, up to 4 a day. They were built on a design from 1879 scaled up for modern use & carried 10,000 tons, the workhorse of the Navy. After the war, they were sold off, primarily to Greece. Two ships remain operational, the John Brown & Jeremiah O'brien, the latter sailing from San Diego to Normandy in 1994, the last original ship from the D-Day invasion in existence.
The Military Sealift Command joint high-speed vessel USNS Spearhead (JHSV-1) pulls into Naval Station Mayport to be inspected. Spearhead is the first of of nine Navy joint high-speed vessels and is designed for rapid intra-theater transport of troops and military equipment.