Question: Which battle included the largest amphibious assault in the Pacific War during World War II: Battle of Chosin Reservoir or Battle of Okinawa?
Context: Cool Amphibious Manufacturers International (CAMI) is an amphibious vehicle manufacturer based in Bluffton, South Carolina in the United States.  They have many different types of amphibious vehicles, including the Hydra Terra, an amphibious bus filled with foam.  CAMI claims that the bus is unsinkable and safer than the DUKW (World War II amphibious assault vehicles), LARCs (Vietnam War era assault vehicles), and the British FV620 Stalwart amphibious load carrier. Simon Bolivar Buckner Jr. (July 18, 1886 – June 18, 1945) was a lieutenant general in the United States Army during World War II.  He served in the Pacific Theater of Operations and commanded the defenses of Alaska early in the war.  Following that assignment, he was promoted to command the 10th Army, which conducted the amphibious assault on the Japanese island of Okinawa on April 1, 1945.  He was killed during the closing days of the Battle of Okinawa by enemy artillery fire, making him the highest-ranking U.S. military officer lost to enemy fire during World War II. 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". Marine Transport Squadron 152 (VMR-152) was an air transport of the United States Marine Corps that was responsible for the movement of personnel, equipment, and supplies.  The squadron flew fixed-wing cargo aircraft to include the R4D Skytrain and the R4Q Flying Boxcar.  The squadron saw combat during World War II and the Korean War with their most notable contributions coming during the early stages of the Battle of Guadalcanal and during the Marine breakout during the Battle of Chosin Reservoir.  The squadron was decommissioned in the late 1950s. 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 "Okinawa" (LPH–3) was the second "Iwo Jima"-class amphibious assault ship of the United States Navy.  She was the second Navy ship assigned the name "Okinawa", in honor of the World War II Battle of Okinawa. The Battle of Chosin Reservoir, also known as the Chosin Reservoir Campaign or the Changjin Lake Campaign (Korean: 장진호 전투 ; hanja: 長津湖戰鬪; rr: "Jangjin ho jeontu"; ), was a decisive battle in the Korean War.  The name "Chosin" is derived from the Japanese pronunciation ""Chōshin"", instead of Korean pronunciation The Battle of Okinawa (Japanese: 沖縄戦 , Hepburn: Okinawa-sen ) (Okinawan: 沖縄戦 , "Uchinaa ikusa " ), codenamed Operation Iceberg, was a major battle of the Pacific War fought on the island of Okinawa by United States Marine and Army forces against the Imperial Japanese Army and included the largest amphibious assault in the Pacific War during World War II, the April 1, 1945, invasion of Okinawa itself.  The 82-day battle lasted from April 1 until June 22, 1945.  After a long campaign of island hopping, the Allies were planning to use Okinawa, a large island only 340 mi away from mainland Japan, as a base for air operations for the planned invasion of the Japanese home islands. Alpha Lyons Bowser (August 21, 1910 – July 13, 2003) was a United States Marine Corps lieutenant general.  He was a combat veteran of World War II and the Korean War — decorated for his actions during the Battle of Iwo Jima and in the Battle of Chosin Reservoir. Thomas Lee Ridge (February 14, 1915 – September 13, 1999) was a United States Marine Corps officer who was wounded in Okinawa during World War II in 1945.  He received the Silver Star for heroic conduct in the Korean War during street fighting in Seoul, Korea and the Legion of Merit with Combat "V" for his role in the defense of Hagaru-ri and the evacuation from the Chosin Reservoir area.  He served as an attache to Columbia and Ecuador.  After retiring from the Marine Corps in the rank of colonel in 1964, he worked as a Department of Defense civilian for 14 years.
Answer: Battle of Okinawa