Question: Richard E. Kraus was a United States Marine who was killed during what battle that was codenamed Operation Stalemate II?
Context: Richard Keith Sorenson (August 28, 1924 – October 9, 2004) was a United States Marine who, as a private, received the Medal of Honor during World War II for his heroism during the Marine landing on Kwajalein Atoll on the night of February 1,-February 2, 1944.  He threw himself on an exploding Japanese grenade, that was part of US munitions captured during the Battle of Bataan, to save the lives of five fellow Marines.  Amazingly, although fragments of the grenade ripped through his thighs, hips, right arm and right leg, he lived through the action.  Of the 27 Marines who similarly threw themselves on grenades to save the lives of their fellow Marines during World War II, Sorenson was one of only four who survived.  Fellow Medal of Honor recipients Richard E. Bush, Jacklyn H. Lucas and Carlton R. Rouh were the other three survivors. USS "Richard E. Kraus" (DD-849/AG-151) was a "Gearing"-class destroyer of the United States Navy, named for Marine Private First Class Richard E. Kraus (1925–1944), who was awarded the Medal of Honor posthumously for his "conspicuous gallantry" during the Battle of Peleliu. The Battle of Angaur was a battle of the Pacific campaign in World War II, fought on the island of Angaur in the Palau Islands from 17 September—22 October 1944.  This battle was part of a larger offensive campaign known as Operation Forager which ran from June 1944 to November 1944 in the Pacific Theater of Operations, and Operation Stalemate II in particular. Richard Edward Kraus (November 24, 1925October 3, 1944) was a United States Marine who was killed in action in World War II during the Battle of Peleliu on October 3, 1944.  He posthumously received the Medal of Honor, the highest military honor awarded by the United States. The Battle of Peleliu, codenamed Operation Stalemate II by the United States military, was fought between the U.S. and the Empire of Japan during the Mariana & Palau Campaign of World War II, from September to November 1944, on the island of Peleliu. The Battle of Kilinochchi (codenamed Operation Unceasing Waves II by the Tamil Tigers) was a battle that occurred in September 1998 for the control of the city of Kilinochchi in Sri Lanka (geographical coordinates ).  The battle was fought between the Sri Lankan Army (SLA) and the Liberation Tigers of Tamil Eelam (LTTE). The Battle of Alasay, codenamed Operation Dinner Out, was a military operation carried out by French troops of the Chasseurs Alpins's 27e Battalion and the Afghan National Army (ANA) 1st "Kandak" (battalion) between 14 and 23 March 2009.  Marine Embedded Training Team 6-4 as well as other US units provided air support, both with attack helicopters and A-10 and F-15E strike aircraft.  The operation enabled the construction of two bases for the Afghan Army in the Alasay valley, which had been guerrilla control since 2006. South St. Paul Municipal Airport (ICAO: KSGS, FAA LID: SGS) , also known as Richard E. Fleming Field or simply Fleming Field, is a city owned public use airport located two miles (3 km) south of the central business district of South St. Paul, a city in Dakota County, Minnesota, United States.  It is named for Richard E. Fleming, a United States Marine Corps Naval Aviator during World War II who was posthumously awarded a Medal of Honor. 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. Operation Whalers was a United States Marine Corps military operation that took place in Afghanistan's Kunar Province, in August 2005, just weeks after Operation Red Wings.  Like Operation Red Wings, the objective of Operation Whalers was the disruption of Anti-Coalition Militia (ACM) activity in the region in support of further stabilizing the region for unencumbered voter turnout for the September 18, 2005 Afghan National Parliamentary Elections.  Operation Whalers was planned and executed by the 2nd Battalion of the 3rd Marine Regiment (2/3).  The emphasis of the operation was an Anti-Coalition Militia cell led by Ahmad Shah, which was one of 22 identified ACM groups operating in the region at that time, and was the most active.  Ahmad Shah's cell was responsible for the Navy SEAL ambush and subsequent MH-47 shootdown that killed, in total, 19 U.S. special operations personnel during Operation Red Wings.  Operation Whalers, named after the Hartford / New England Whalers professional hockey team, was the "sequel" to Operation Red Wings in that it was aimed at furthering stabilization of the security situation in the restive Kunar Province of Eastern Afghanistan, a long-term goal of American and coalition forces operating in the area at that time.  Operation Whalers, conducted by a number of Marine infantry companies of 2/3 with attached Afghan National Army soldiers and supported by conventional Army aviation, intelligence, and combat arms forces units and U.S. Air Force aviation assets, proved a success.  Anti-Coalition Militia activity dropped substantially and subsequent human intelligence and signals intelligence revealed that Ahmad Shah had been seriously wounded.  Shah, who sought to disrupt the September 18, 2005 Afghan National Parliamentary Elections, was not able to undertake any significant Anti-Coalition operations subsequent to Operation Whalers in Kunar or neighboring provinces.
Answer: The Battle of Peleliu