Question: During which war did the commander serve the "Tropic Lightening"? 

full_context: Document 1: Creighton Abrams: Creighton Williams Abrams Jr. (September 15, 1914 – September 4, 1974) was a United States Army general who commanded military operations in the Vietnam War from 1968–72 (which saw U.S. troop strength in South Vietnam fall from a peak of 543,000 to 49,000). He served as Chief of Staff of the United States Army from 1972 until shortly before his death in 1974. In 1980, the U.S. Army named its new main battle tank, the "M1 Abrams", after General Abrams. The IG Farben building in Germany was also named after him from 1975 to 1995.
Document 2: 7th Infantry Division (United States): The 7th Infantry Division is an infantry division of the United States Army. Today, it exists as a unique 250-man deployable headquarters at Joint Base Lewis-McChord overseeing several units, though none of the 7th Infantry Division's own historic forces are active.
Document 3: 2nd Infantry Division (United States): The 2nd Infantry Division ("Indianhead"; "2ID," "2nd ID", or "Second D") is a formation of the United States Army. Its current primary mission is the defense of South Korea in the initial stages of an invasion from North Korea until other American units can arrive. There are approximately 17,000 soldiers in the 2nd Infantry Division, with 10,000 of them stationed in South Korea, accounting for about 35% of the United States Forces Korea personnel.
Document 4: William Westmoreland: William Childs Westmoreland (March 26, 1914 – July 18, 2005) was a United States Army general, who most notably commanded U.S. forces during the Vietnam War from 1964 to 1968. He served as Chief of Staff of the United States Army from 1968 to 1972.
Document 5: Kevin C. Kiley: Major General (Ret.) Kevin C. Kiley (born October 18, 1950) was the 41st Surgeon General of the United States Army and commander of the U.S. Army Medical Command, Fort Sam Houston, Texas. He was commander of Walter Reed Army Medical Center and North Atlantic Regional Medical Command twice, from 2002 to 2004, and as acting commander, March 1–2, 2007. He submitted his request to retire from the U.S. Army on March 11, 2007, in the wake of the Walter Reed Army Medical Center neglect scandal, and was removed from his nominative billet as a Lieutenant General. Pending retirement, he was assigned to a temporary billet at the General Officer Management Office at the Pentagon in the grade Major General. His retirement in the grade of Major General was subsequently approved.
Document 6: Viet Xuan Luong: Viet Xuan Luong (Vietnamese: "Lương Xuân Việt") is a United States Army Brigadier General. He is the first American officer promoted to flag rank who was born in Vietnam. He is currently the Deputy Commanding General (Operations), Eighth Army. He previously served as chief of staff of United States Army Central. His prior assignments included Director of Joint and Integration, Headquarters Department of the Army, G-8; assistant division commander–maneuver for the 1st Cavalry Division at Fort Hood, concurrent with assignment as commander, Train Advise Assist Command – South, Resolute Support Mission Joint Command, North Atlantic Treaty Organization, Afghanistan.
Document 7: 82nd Airborne Division: The 82nd Airborne Division is an elite airborne infantry division of the United States Army, specializing in parachute assault operations into denied areas. Based at Fort Bragg, North Carolina, the 82nd Airborne Division is part of the XVIII Airborne Corps. The 82nd Airborne Division is the U.S. Army's most strategically mobile division. Some sources consider the 82nd Airborne Division the most highly trained light infantry division in the world. Recently the 82nd Airborne has been conducting operations in Iraq. The 82nd Airborne has been assigned to advise and assist Iraqi Security Forces.
Document 8: 25th Infantry Division (United States): The 25th Infantry Division (nicknamed "Tropic Lightning" and the "Electric Strawberry" is a U.S. Army division based in Hawaii. The division, which was activated on 1 October 1941 in Hawaii, conducts military operations in the Asia-Pacific region. Its present deployment is composed of Stryker, light infantry, airborne, and aviation units.
Document 9: Vincent K. Brooks: Vincent Keith Brooks (born October 24, 1958) is a United States Army general who is the current commander of United States Forces Korea, United Nations Command and ROK-U.S. Combined Forces Command. He previously served as commanding general of the United States Army Pacific and before that as the commanding general of Third Army. Brooks was the United States Army's Deputy Director of Operations during the War in Iraq, and frequently briefed the media, which raised his public profile. He also served as the Chief of Army Public Affairs The Pentagon. He later was commanding general of the 1st Infantry Division. General Brooks assumed his current assignment on April 30, 2016.
Document 10: 299th Cavalry Regiment (United States): The 299th Cavalry Regiment, formerly the 299th Infantry Regiment, nicknamed the "The Koa Regiment", is a unit of the Hawaii Army National Guard. It was established in 1923 from the old 2nd Hawaiian Infantry Regiment, and it served during World War II as part of the 24th Infantry Division. The name "Koa" comes from the Hawaiian word for "Warrior", and is currently headquartered in Hilo, Hawaii. The 1st and 2nd Battalions, 299th Infantry were federally activated in 1968 to support the United States Army Pacific during the Vietnam War. More recently 2nd Battalion, 299th Infantry Regiment deployed to Iraq and again after being re-flagged in 2007 as 1st Squadron, 299th Cavalry Regiment.
Document 11: Samuel Tankersley Williams: Lieutenant General Samuel Tankersley Williams (August 25, 1897 – April 26, 1984) was a senior United States Army officer. Williams became prominent in army history for being reduced in rank from brigadier general to colonel, and then resuscitating his career to again advance to general officer rank. He also commanded the 25th Infantry Division during the Korean War and served as commander of Military Assistance and Advisory Group – Vietnam, the predecessor to Military Assistance Command – Vietnam.
Document 12: 1st Cavalry Division (United States): The 1st Cavalry Division ("First Team") is a combined arms division and is one of the most decorated combat divisions of the United States Army, as well as the other four branches of the U.S. military. It is based at Fort Hood, Texas. It was formed in 1921 and served during World War II, the Korean War, the Vietnam War, the Persian Gulf War, with the Stabilization Force in Bosnia-Herzegovina, in the Iraq War, in the War in Afghanistan and in Operation Freedom’s Sentinel. As of 2017, the 1st Cavalry Division is subordinate to III Corps and is commanded by Major General John C. Thomson III.
Document 13: 503rd Infantry Regiment (United States): The 503rd Infantry Regiment, formerly the 503rd Parachute Infantry Regiment (PIR) and the 503rd Airborne Infantry Regiment (AIR), is an airborne infantry regiment of the United States Army. The regiment served as an independent regiment in the Pacific War during World War II; at Fort Campbell, Kentucky; in Okinawa, Japan; and in Germany. Regimental elements have been assigned to the 2nd Infantry Division, the 11th Airborne Division, the 24th Infantry Division, the 82nd Airborne Division, and the 173rd Airborne Brigade Combat Team. Regimental elements have participated in campaigns in the Vietnam War, Operation Enduring Freedom–Afghanistan, and Operation Iraqi Freedom. The regiment claims 15 Medal of Honor recipients: two from World War II, 10 from Vietnam, and three from Afghanistan. A parent regiment under the U.S. Army Regimental System. The regiment's 1st and 2nd Battalions are active, assigned to the 173rd Airborne Brigade, based at Caserma Ederle, Vicenza, Italy.
Document 14: Robert Sink: Lieutenant General Robert Frederick Sink (April 3, 1905 – December 13, 1965) was a senior United States Army officer who fought during World War II, the Korean War, and early parts of the Vietnam War, though he was most famous for his command of the 506th Parachute Infantry Regiment, part of the 101st Airborne Division, throughout most of World War II, in France, Holland and Belgium. Sink was portrayed in the television miniseries "Band of Brothers" by Captain Dale Dye.
Document 15: 100th Infantry Battalion (United States): The 100th Infantry Battalion is the only infantry unit in the United States Army Reserve. In World War II, the then-primarily Nisei battalion was composed largely of former members of the Hawaii Army National Guard. The 100th saw heavy combat during World War II before and after combining with the 442nd Infantry Regiment, another mostly Nisei military unit, into a single fighting combat team. Based at Fort Shafter, Honolulu, Hawaii, the 100th Battalion has reservists from Hawaii, American Samoa, Guam and Saipan, and has deployed to Iraq and Kuwait. The unit was unofficially nicknamed the "Purple Heart Battalion", with the motto "Remember Pearl Harbor".
ground_truth: Korean War