Ship (AVB), 4 Unclassified miscellaneous vessels (IX), and 36 LSTH. One LST which had been sunk in an accident was later raised and converted into a Covered Barge (YF). Post-war developments United States The end of World War II left the Navy with a huge inventory of amphibious ships. Hundreds of these were scrapped or sunk, and most of the remaining ships were put in "mothballs" to be preserved for the future. Additionally, many of the LSTs were demilitarized and sold to the private sector, along with thousands of other transport ships, contributing to a major downturn in shipbuilding in the United States following the war. Many LSTs were used as targets in aquatic nuclear testing after the war, being readily available and serving no apparent military applications. World War II era LSTs have become somewhat ubiquitous, and have found a number of novel commercial uses, including operating as small freighters, ferries, and dredges. Consequently, construction of LSTs in the immediate post-war years was modest. LST-1153 and LST-1154, commissioned respectively in 1947 and 1949, were the only steam-driven LSTs ever built by the Navy. They provided improved berthing arrangements and a greater cargo capacity than their predecessors. The success of the amphibious assault at Inchon during the Korean War showed the utility of LSTs once again. This was in contrast with the earlier opinion expressed by many military authorities that the advent of the atomic bomb had relegated amphibious landings to a thing of the past. During the Korean War a number of LSTs were converted to transport the much needed, but slow and short range LSU from the United States to the Korean theater of war using the piggy-back method. After arrival the LSU was slid off sideways from the LST. Additionally, LSTs were used for transport in the building of an Air Force base at Thule, Greenland during the Korean War. Fifteen LSTs of what were later to be known as the Terrebonne Parish class were constructed in the early 1950s. These new LSTs were longer and were equipped with four, rather than two, diesel engines, which increased their speed to . Three-inch / 50-caliber twin mounts replaced the old twin 40 mm guns, and controllable pitch propellers improved the ship's backing power. On 1 July 1955, county or, in the case of Louisiana, parish names were assigned to many LSTs, which up to then had borne only