Pictured on the left is the first tank farm on Okinawa. These are 1000 barrel (42,000 gallon) aviation gasoline storage tanks near the mouth of the Hija River. They were filled from tankers by means of pumping barges. From these storage tanks, the gasoline was then pumped to storage tanks at the Yomitan and Kadena airfields through a four-inch victaulic pipeline. Construction on the first tank farm and pipeline on Okinawa commenced on 8 April 1945. This photo was taken on 29 April 1945 during the Battle of Okinawa (April - June 1945).

The petroleum system in Okinawa traces its beginning to the Battle of Okinawa in April 1945. It was designated as Petroleum Distribution System, Okinawa (PDSO), a separate organization under the United States Army Japan, in September 1980. On February 18, 1986, it was redesignated as the 266th Quartermaster Battalion (Provisional).

The 266th Quartermaster Battalion dropped its provisional status on October 16, 1987 and was redesignated as the 505th Quartermaster Battalion.