Question: Which military branch did Jimmy Doolittle serve?

Context paragraphs:
James H. Doolittle Award: The James H. Doolittle Award is an honor presented annually by the Society of Experimental Test Pilots.  It is an award for "outstanding accomplishment in technical management or engineering achievement in aerospace technology".  The award consists of a perpetual trophy on permanent display at SETP headquarters, and a smaller replica presented to the recipient.  It is named after General James Doolittle, famous for the Doolittle Raid on Tokyo during World War II.

Cyber and Information Space Command (Germany): The Cyber and Information Space Command (German: "Kommando Cyber- und Informationsraum") (Kdo CIR) is the youngest branch of Germany's military the Bundeswehr.  The decision to form new military branch was presented by Defense Minister Ursula von der Leyen on 26 April 2016, with the command becoming operational on 1 April 2017.  The command's headquarter is Bonn.

Jimmy Doolittle: James Harold Doolittle (December 14, 1896 – September 27, 1993) was an American aviation pioneer.  A Reserve officer in the United States Army Air Corps, Doolittle was recalled to active duty during World War II.  He was awarded the Medal of Honor for personal valor and leadership as commander of the Doolittle Raid, a bold long-range retaliatory air raid on the Japanese main islands, on 18 April 1942, four months after the Attack on Pearl Harbor.  He was eventually promoted to lieutenant general and commanded the Twelfth Air Force over North Africa, the Fifteenth Air Force over the Mediterranean, and the Eighth Air Force over Europe.

Army: An army (from Latin "arma" "arms, weapons" via Old French "armée", "armed" (feminine)) or ground force is a fighting force that fights primarily on land.  In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or state.  It may also include other branches of the military such as the air force via means of aviation corps.  Within a national military force, the word army may also mean a field army.  They differ from army reserves who are activated only during such times as war or natural disasters.

Officer training: Officer training refers to the training that most military officers must complete before acquiring an officer rank.  A potential recruit becomes an officer cadet, someone in training.  An officer in training can either be trained in a military college, such as West Point, or taken from the enlisted ranks.  After this training is complete, the recruit in question becomes a fully fledged officer, taking on a commanding position in his or her military branch.

Jonna Doolittle Hoppes: Jonna Doolittle Hoppes (born Jonna Doolittle) is an American author whose works include oral histories and biographies.  The granddaughter of aviation pioneer and United States Air Force General Jimmy Doolittle, she is an enthusiastic speaker and represents the Doolittle family at events throughout the world.

Central Military Commission (China): The Central Military Commission (CMC) refers to the parallel national defense organizations of the Communist Party of China and the People's Republic of China: the Central Military Commission of the Communist Party of China, a Party organ under the CPC Central Committee, and the Central Military Commission of the People's Republic of China, a central state organ under the National People's Congress, being the military branch of the national government.

Cyber force: A cyber force is a military branch devoted to cyberwarfare, cybersecurity and counter-cyberwarfare.  An example of a cyber force is the Norwegian Cyber Defence Force.  A Cyber force can be part of a military branch or a combined command.

Sulejman Vokshi: Sulejman Vokshi (1815 - 1890) was an Albanian military commander and leader of the League of Prizren.  A member of the central committee of the league as head of the finances commission, Vokshi also was an important leader of the organization's military branch and an officer of its military staff.

Medical corps: A medical corps is generally a military branch or officer corps responsible for medical care for serving military personnel.  Such officers are typically military physicians.

Supporting paragraphs: James H. Doolittle Award Jimmy Doolittle
Answer: United States Army Air Corps