Question: Only the Brave is a film about which part of the Army Reserve?

Context paragraphs:
Permanent staff instructor: A permanent staff instructor (PSI) is a warrant officer class 2 (WO2), or senior non-commissioned officer (sergeant, staff sergeant or colour sergeant), of the Regular British Army who has been selected to instruct Army Reserve soldiers.  Each AR unit has several PSIs attached to it.  A normal rifle company in a Regular Army battalion has a single WO2, serving in the role of company sergeant major (CSM).  An Army Reserve rifle company normally has two WO2s.  One is the CSM, normally a part-time member of the Army Reserve, and the other is the seconded PSI, the only full-time member of the company.  The PSI is meant to provide the reserve company with the benefit of his professional experience, as well as to ensure that the training and operation of the company adheres to the Army's methods and standards.  The PSI is typically responsible for much of the company's administration work, and usually takes a particular role in the training of junior NCOs (corporals and lance-corporals, and equivalent).

Army Reserve Medical Command: The Army Reserve Medical Command (AR-MEDCOM) vision is to be the Army Reserve's premier Medical Command, supporting the United States' national military strategy.  The Army Reserve Medical Command mission is to provide trained, equipped, ready, skill-rich Citizen-Soldiers, to meet medical requirements across full spectrum military operations.  ARMEDCOM provides command and control for table of distribution and allowance (TDA) reserve medical units within the contiguous United States.

Only the Brave (2006 film): Only the Brave is a 2006 independent film about the 100th Infantry Battalion/442nd Regimental Combat Team, a segregated World War II fighting unit primarily made up of "Nisei" Japanese Americans, which for its size and length of service became the most decorated unit in U.S. military history.  The film, produced and directed by Lane Nishikawa is a fictionalized account of the rescue of the Lost Battalion.

81st Infantry Division (United States): The 81st Infantry Division ("Wildcat") was an infantry division of the United States Regular Army that was mobilized for service in both World War I and World War II.  The division was inactivated in 1965 and reactivated as the 81st Army Reserve Command (ARCOM) 1967.  During that time, the 81st ARCOM was responsible for deploying US Army Reserve units to Vietnam, Southwest Asia, and the Balkans.  The 81st was redesignated in 1996 as the 81st Regional Support Command (RSC) and is responsible for all Army Reserve units in the southeast United States and Puerto Rico.

United States Army Reserve Command: United States Army Reserve Command (USARC) commands all United States Army Reserve units.  USARC is responsible for the staffing, training, management and deployment of its units to ensure their readiness for Army missions.  The Army Reserve which consists of three main categories of units.

Army Reserve (United Kingdom): The Army Reserve (previously known as the Territorial Force, Territorial Army (TA) and the Territorial and Army Volunteer Reserve (TAVR) from 1920 to 2014) is the active-duty volunteer reserve force and integrated element of the British Army.  The Army Reserve was created as the Territorial Force in 1908 by the Secretary of State for War, Richard Haldane, when the Territorial and Reserve Forces Act 1907 combined the previously civilian-administered Volunteer Force, with the mounted Yeomanry (at the same time the Militia was renamed the Special Reserve).  Most Volunteer infantry units had unique identities, but lost these in the reorganisation, becoming Territorial battalions of Regular Army infantry regiments.  Only one infantry unit, the London Regiment, has maintained a separate identity.

442nd Infantry Regiment (United States): The 442nd Regimental Combat Team is an infantry regiment of the United States Army, part of the Army Reserve.  The regiment was a fighting unit composed almost entirely of American soldiers of Japanese ancestry (mostly from Hawaii) who fought in World War II.  Most of the families of mainland Japanese Americans were confined to internment camps in the United States interior.  Beginning in 1944, the regiment fought primarily in Europe during World War II, in particular Italy, southern France, and Germany.

Army Reserve Sustainment Command: The Army Reserve Sustainment Command (ARSC) is a subordinate command of the 377th Theater Sustainment Command.  The Army Reserve Sustainment Command is located in Birmingham, Alabama.  The command comprises five subordinate commands and has command and control of almost 750 Army Reserve Soldiers throughout the United States.  The United States Army Reserve Sustainment Command provides trained and ready Soldiers on a continuous and global basis to U.S. Army Materiel Command (AMC), the Assistant Secretary of the Army for Acquisition, Logistics and Technology (ASA(ALT)), the Defense Contract Management Agency (DCMA) and the Logistics Civil Augmentation Program (LOGCAP) in order to sustain Unified Land Operations.

Office of the Chief, Army Reserve: The Office of the Chief, Army Reserve (OCAR) is located at Fort Belvoir, VA, and provides the Chief, Army Reserve (CAR) with a staff of functional advisors who develop and execute Army Reserve plans, policies and programs, plus administer Army Reserve personnel, operations and funding.  The CAR is responsible for plans, policies and programs affecting all Army Reserve Soldiers, including those who report directly to the Army.  OCAR is made up of specialized groups that advise and support the CAR on a wide variety of issues.

Michele S. Jones: Michele S. Jones was the first woman in the United States Army Reserve to reach the position of command sergeant major of the U.S. Army Reserve.  She was the first female non-commissioned officer to serve in the highest enlisted position of a component of the U.S. Army, active or reserve, and was at one time the highest-ranking African-American female enlisted person in any branch of the United States military, as well as the highest-ranking enlisted African American in the Army Reserve.

Supporting paragraphs: Only the Brave (2006 film) 442nd Infantry Regiment (United States)
Answer: 442nd Regimental Combat Team