Question: Among the Allies of World War II what United States armed force did the highest ranking official to die on D-Day serve?

Context articles: Allies of World War II
The National WWII Museum
T1 tanker
Sepp Dietrich
History of the United States Army
Don Pratt
Indian National Army
SS Red Oak Victory
Conscription in the United States
Irish in the British Armed Forces

The Allies of World War II, called the United Nations from the 1 January 1942 declaration, were the countries that together opposed the Axis powers during the Second World War (1939–1945).
 The Allies promoted the alliance as seeking to stop German, Japanese and Italian aggression.
The National WWII Museum, formerly known as the D-Day Museum, is a military history museum located in the Central Business District of New Orleans, Louisiana, on Andrew Higgins Drive between Camp Street and Magazine Street.
 The museum focuses on the contribution made by the United States to Allied victory in World War II.
 Founded in 2000, it was later designated by the U.S. Congress as America's official National World War II Museum in 2003.
 The Museum maintains an affiliation with the Smithsonian Institution.
 The mission statement of the Museum emphasizes the American experience in World War II.
The T1 tanker or T1 are a class of sea worthy small tanker ships used to transport fuel oil before and during World War II, Korean War and Vietnam War.
 The T1 tanker classification is still in use today.
 T1 tankers are about 200 to 250 feet in length and are able to sustain a top speed of about 12 knots.
 The hull designation "AO" is used by the US Navy to denote the ship is a T1 oil tanker and "AOG" that the T1 is a gasoline tanker.
 The small size allows the T1 to enter just about any sea port or to anchor around a small island, this was very useful during the Pacific War.
 The T1 tanker can carry about 48,000 to 280,000 BBLs.
 Some T1 tankers were used to transport goods other than oil, a few were used for black oil-crude oil, diesel, chemicals and rarely bulk cargo like grain.
 T1 tankers are also called liquid cargo carriers.
 The T1 tanker has about a 6,000 to 35,000 DWT of cargo.
 The small size also gives the ships short turn around time for repair, cleaning, loading and unloading.
 A T1 tanker carrying dirty cargo, like crude oil needs a few weeks of labor to clean before carrying clean cargo.
 Most T1 ships during World War II were named after major oil fields. T1 tanker are operated by the US Navy, War Shipping Administration and United States Maritime Commission.
 Some T1 were loaned to England in the Lend-Lease program for World War II, after the war most were returned to the USA.
 After World War II many of the T1 ships were sold to for civilian use.
 Each T1 had emergency life rafts on the boat deck.
 The ships had cargo booms and piping to load and unload fuel.
 During war time the T1 are armed for protection with deck guns.
 A typical ship may have one single 3"/50 dual purpose gun, two 40 mm guns and three single Oerlikon 20 mm cannon.
 A T1 at war time normally had a crew of 38 and up to 130.
 If operating as a United States Merchant Marine ship, the crew would be a mix of civilian Merchant Marines and United States Navy Armed Guards to man the guns.
Josef "Sepp" Dietrich (28 May 1892 – 21 April 1966) was an "Oberst-Gruppenführer" in the Waffen-SS, the armed paramilitary branch of the "Schutzstaffel" (SS), who commanded units up to army level during World War II.
 Prior to 1929, he was Adolf Hitler's chauffeur and bodyguard but received rapid promotion after his participation in the extrajudicial executions of political opponents during the 1934 purge known as the Night of the Long Knives.
 He later commanded 6th Panzer Army during the Battle of the Bulge.
 Despite having no formal staff officer education, Dietrich was, along with Paul Hausser, the highest ranking officer in the Waffen-SS.
 After the war he was imprisoned by the United States for war crimes and later by West Germany for his involvement in the 1934 purge.
The history of the United States Army began in 1775.
 From its formation, the United States Army has been the primary land based part of the United States Armed Forces.
 The Army's primary responsibility has been the fighting of land battles and military occupation.
 The Corps of Engineers has a major role in controlling rivers inside the United States.
 The Continental Army was founded in response to a need for professional soldiery in the American Revolutionary War in order to fight the invading British Army.
 Until the 1940s, the Army was relatively small in peacetime.
 In 1947, the Air Force became completely independent from the Army Air Forces.
 The Army was under the control of the War Department until 1947, and the Defense Department since then.
 The U.S. Army fought the War of 1812 (1812–15), American Civil War (1861–65), Spanish–American War (1898), World War I (1917–18), World War II (1941–45), Korean War (1950–53) and Vietnam War (1965–71).
 After the Cold War ended in 1991, the U.S. Army has focused on Western Asia, and was involved in the 1991 Gulf War and war in Iraq, and the war in Afghanistan.
Brigadier General Don Forrester Pratt (July 12, 1892 -- June 6, 1944) was a United States Army officer.
 He was the assistant division commander (ADC) of the 101st Airborne Division and was the highest-ranking Allied officer killed on D-Day.
The Indian National Army (INA; "Azad Hind Fauj" ; "lit."
: Free Indian Army) was an armed force formed by Indian nationalists in 1942 in Southeast Asia during World War II.
 Its aim was to secure Indian independence from British rule.
 It formed an alliance with Imperial Japan in the latter's campaign in the Southeast Asian theatre of WWII.
 The army was first formed in 1942 under Mohan Singh, by Indian PoWs of the British-Indian Army captured by Japan in the Malayan campaign and at Singapore.
 This first INA collapsed and was disbanded in December that year after differences between the INA leadership and the Japanese military over its role in Japan's war in Asia.
 It was revived under the leadership of Subhas Chandra Bose after his arrival in Southeast Asia in 1943.
 The army was declared to be the army of Bose's "Arzi Hukumat-e-Azad Hind" (the Provisional Government of Free India).
 Under Bose's leadership, the INA drew ex-prisoners and thousands of civilian volunteers from the Indian expatriate population in Malaya (present-day Malaysia) and Burma.
 This second INA fought along with the Imperial Japanese Army against the British and Commonwealth forces in the campaigns in Burma, in Imphal and at Kohima, and later against the successful Burma Campaign of the Allies.
SS "Red Oak Victory" is a U.S. military Victory ship of the "Boulder Victory"-class cargo ship used in the Second World War.
 She was preserved to serve as a museum ship in Richmond, California, and is part of the Rosie the Riveter/World War II Home Front National Historical Park.
 She was one of 534 Victories built during World War II, but one of only a few of these ships to be transferred from the Merchant Marine to the United States Navy.
 She was named after Red Oak, Iowa, which suffered a disproportionate number of casualties in early World War II battles.
 (Montgomery County ranked third among Iowa counties in World War II casualties per capita).
 The ship was active during World War II, the Korean War, and the Vietnam War.
Conscription in the United States, commonly known as the draft, has been employed by the federal government of the United States in four conflicts: the American Civil War, World War I, World War II, and the Cold War (including both the Korean and Vietnam Wars).
 The third incarnation of the draft came into being in 1940 through the Selective Training and Service Act.
 It was the country's first peacetime draft.
 From 1940 until 1973, during both peacetime and periods of conflict, men were drafted to fill vacancies in the United States Armed Forces that could not be filled through voluntary means.
 The draft was ended when the United States Armed Forces moved to an all-volunteer military force.
 However, the Selective Service System remains in place as a contingency plan; all male civilians between the ages of 18 and 25 are required to register so that a draft can be readily resumed if needed.
The Irish in the British Armed Forces refers to the history of Irish people serving in the British Armed Forces (including the British Army, the Royal Navy, the Royal Air Force and other elements).
 Ireland was ruled as part of the United Kingdom from 1800-1922 and during this time in particular many Irishmen fought in the British Army.
 Different social classes joined the military for various reasons, including the Anglo-Irish officers who thoroughly identified with the British Empire, while others, typically poorer Irish Catholics did so to feed their families or seeking adventure.
 Many Irishmen and members of the Irish diaspora in Britain and also Ulster-Scots served in both World War I and World War II as part of the British forces.
 However, especially since the advent of Irish independence and The Troubles, the topic of enlistment in the British forces has been controversial for the Irish at home, but does still occur.
 Since partition, Irish citizens have continued to have the right to serve in the British Army.
 Since 2007, when troops finally withdrew from the streets of Northern Ireland, the number of Irish citizens joining has increased, reaching its highest levels since World War II.