William M. Hobby was laid down as the Rudderow-class destroyer escort USS William M. Hobby on 15 November 1943 by the Charleston Navy Yard. She was built in a drydock and floated out on 2 February 1944, so there was no formal launching. The ship was reclassified as a Crosley-class high-speed transport and redesignated APD-95 on either 17 June 1945 or 17 July 1944. After conversion to her new role, she was simultaneously christened—sponsored by Miss Catherine Hobby, sister of the ships namesake, Commander William M. Hobby—and commissioned on 4 April 1945 with Lieutenant Commander Frank. N. Christiansen, USNR, in command.
On 16 August 1945, William M. Hobby got underway for Hawaii. Reaching Pearl Harbor on 22 August 1945, she got underway on 24 August 1945 for the Marshall Islands, in company with high-speed transports USS Ira Jeffrey and USS Blessman, and arrived at Eniwetok on 1 September 1945. Pushing on to the Philippines, she anchored in Manila Bay on 5 September 1945. William M. Hobby cruised in the Philippine Islands—touching at Subic Bay, Zamboanga, Mindanao, Bugo, Macajalar Bay, and San Pedro Bay—until she departed for Okinawa, and from thence to Japan. Reaching Wakayama, Japan, on 28 September 1945, William M. Hobby soon got underway for Hiro Wan, Honshu, with Underwater Demolition Team 5 embarked. Daybreak on 1 October 1945 found her entering the Inland Sea. There, she joined destroyer minelayer USS Tracy, which led William M. Hobby to her anchorage at Hiro Wan. That morning, William M. Hobby sighted a floating naval mine off her port bow and destroyed it with 40-millimeter, 20-millimeter, and rifle fire. William M. Hobbys embarked underwater demolition teamreconnoitered beaches and shore installations at Hiro Wan from 2 October 1945 to 10 October 1945 to prepare the way for the arrival of Americanoccupation troops in the Kure area. On 11 October 1945, William M. Hobby got underway for the island of Shikoku and arrived at the port of Mitsuhamalater that day. She disembarked the 15 United States Armyofficers, 18 enlisted men, and two Japanese officers whom she had carried as passengers and remained at anchor off Mitsuhama while Underwater Demolition Team 5 reconnoitered the beaches there. After returning once more to Hiro Wan, William M. Hobby got underway for the United States on 14 October 1945. Proceeding via Guam, Eniwetok, Pearl Harbor, San Diego, and the Panama Canal, she arrived at Philadelphia, Pennsylvania, on 9 December 1945. She subsequently shifted southward via Norfolk to Green Cove Springs, Florida, where she arrived on 6 January 1946.
Transferred to the government of South Korea on a grant-in-aid on 23 July 1967, William M. Hobby was reclassified in Republic of Korea Navy service as a gunboat and renamed ROKS Chr Ju. In 1972, Chr Ju was reclassified in South Korean service as a high-speed transport and redesignated APD-87. Chr Ju was stricken by the Republic of Korea Navy and scrapped in 1989.