USS "Sheldrake" (AM-62/AGS-19) was an "Auk"-class minesweeper built for the United States Navy during World War II.
 The ship was named after the sheldrake duck.
 The ship earned four battle stars during World War II.
 She was converted to a survey ship and re-designated AGS-19 in 1952 and remained in commission until 1968.
 She was sold for scrap in 1971.
USS "Enterprise" (CV-6), was the seventh U.S. Navy vessel to bear the name.
 Colloquially called "the Big E", she was the sixth aircraft carrier of the United States Navy.
 A "Yorktown"-class carrier, she was launched in 1936 and was one of only three American carriers commissioned before World War II to survive the war (the others being "Saratoga" and "Ranger" ).
 She participated in more major actions of the war against Japan than any other United States ship.
 These actions included the Attack on Pearl Harbor (18 dive bombers of VS-6 were over the harbor, 6 were shot down with a loss of eleven men, making her the only American Aircraft carrier with men at Pearl Harbor during the Attack and the first to receive casualties during the Pacific War), the Battle of Midway, the Battle of the Eastern Solomons, the Battle of the Santa Cruz Islands, various other air-sea engagements during the Guadalcanal Campaign, the Battle of the Philippine Sea, and the Battle of Leyte Gulf.
 "Enterprise" earned 20 battle stars, the most for any U.S. warship in World War II, and was the most decorated U.S. ship of World War II, She is also the first American ship to sink an enemy vessel during the Pacific War, the sole surviving pilot of the six planes shot down over Pearl Harbor sank Japanese submarine I-70 on 10 December 1941.
 On three occasions during the Pacific War, the Japanese announced that she had been sunk in battle, resulting in her being named "The Grey Ghost".
USS "Bennington" (CV/CVA/CVS-20) was one of 24 "Essex"-class aircraft carrier s built during World War II for the United States Navy.
 The ship was the second US Navy ship to bear the name, and was named for the Revolutionary War Battle of Bennington (Vermont).
 "Bennington" was commissioned in August 1944, and served in several of the later campaigns in the Pacific Theater of Operations, earning three battle stars. Decommissioned shortly after the end of the war, she was modernized and recommissioned in the early 1950s as an attack carrier (CVA), and then eventually became an Antisubmarine Aircraft Carrier (CVS).
 In her second career, she spent most of her time in the Pacific, earning five battle stars for action during the Vietnam War.
 She served as the recovery ship for the Apollo 4 space mission.
USS "Kearsarge" (CV/CVA/CVS-33) was one of 24 "Essex"-class aircraft carrier s completed during or shortly after World War II for the United States Navy.
 The ship was the third US Navy ship to bear the name, and was named for a Civil War-era steam sloop.
 "Kearsarge" was commissioned in March 1946.
 Modernized in the early 1950s as an attack carrier (CVA), she served in the Korean War, for which she earned two battle stars.
 In the late 1950s she was further modified to become an anti-submarine carrier (CVS).
 "Kearsarge" was the recovery ship for the last two manned Project Mercury space missions in 1962–1963.
 She completed her career serving in the Vietnam War, earning five battle stars.
USS "Essex" (CV/CVA/CVS-9) was an aircraft carrier and the lead ship of the 24-ship "Essex" class built for the United States Navy during World War II.
 She was the fourth US Navy ship to bear the name.
 Commissioned in December 1942, "Essex" participated in several campaigns in the Pacific Theater of Operations, earning the Presidential Unit Citation and 13 battle stars.
 Decommissioned shortly after the end of the war, she was modernized and recommissioned in the early 1950s as an attack carrier (CVA), and then eventually became an antisubmarine aircraft carrier (CVS).
 In her second career, she served mainly in the Atlantic, playing a role in the Cuban Missile Crisis.
 She also participated in the Korean War, earning four battle stars and the Navy Unit Commendation.
 She was the primary recovery carrier for the Apollo 7 space mission.
Lieutenant Commander Richard Halsey "Dick" Best, USN, (March 24, 1910 – October 28, 2001) was a dive bomber pilot and squadron commander in the United States Navy during World War II.
 Stationed on the Enterprise, Best led his squadron in most of the major actions of the early war in the Pacific before being invalided out with tuberculosis in 1942.
USS "Princeton" (CV/CVA/CVS-37, LPH-5) was one of 24 "Essex"-class aircraft carrier s built during and shortly after World War II for the United States Navy.
 The ship was the fifth US Navy ship to bear the name, and was named for the Revolutionary War Battle of Princeton.
 "Princeton" was commissioned in November 1945, too late to serve in World War II, but saw extensive service in the Korean War, in which she earned eight battle stars, and the Vietnam War.
 She was reclassified in the early 1950s as an attack carrier (CVA), then as an Antisubmarine Aircraft Carrier (CVS), and finally as an amphibious assault ship (LPH), carrying helicopters and marines.
 One of her last missions was to serve as the prime recovery ship for the Apollo 10 space mission.
USS "Ticonderoga" (CV/CVA/CVS-14) was one of 24 "Essex"-class aircraft carrier s built during World War II for the United States Navy.
 The ship was the fourth US Navy ship to bear the name, and was named after the capture of Fort Ticonderoga in the American Revolutionary War.
 "Ticonderoga" was commissioned in May 1944, and served in several campaigns in the Pacific Theater of Operations, earning five battle stars. Decommissioned shortly after the end of the war, she was modernized and recommissioned in the early 1950s as an attack carrier (CVA), and then eventually became an antisubmarine carrier (CVS).
 She was recommissioned too late to participate in the Korean War, but was very active in the Vietnam War, earning three Navy Unit Commendations, one Meritorious Unit Commendation, and 12 battle stars.
Richard Halsey is an American film editor with more than 60 credits from 1970 onwards.
 An alumnus of Hollywood High School, he won an Academy Award for Best Film Editing at the 49th Academy Awards for editing "Rocky" with Scott Conrad and has been nominated for one BAFTA and one Emmy Award.
 He often works with his wife Colleen and they are credited together.
 Both have been elected to membership in American Cinema Editors (A.C.E.); Halsey has been a member since 1988.
 He is now living in the Hollywood Hills.
USS Ashtabula (AO-51) was a "Cimarron"-class fleet oiler of the United States Navy in service from 1943 to 1991.
 She survived three wars and was awarded eight battle stars for World War II service, four battle stars for Korean War service, and eight campaign stars for Vietnam War service.
 In the mid-1960s "Ashtabula" became the lead ship of her class, when she and seven other "Cimarron"-class oilers were lengthened ("jumboized").
 She has been the only U.S. Navy ship to bear the name "Ashtabula", after the City of Ashtabula which was named after the Ashtabula River in northeast Ohio.

Question: Richard Halsey Best was stationed on the ship that earned how many battle stars?
Answer: 20