Please answer the following question: Information: - Braxton Bragg (March 22, 1817 September 27, 1876) was a career United States Army officer, and then a general in the Confederate States Armya principal commander in the Western Theater of the American Civil War and later the military advisor to the Confederate President Jefferson Davis. - The United States Armed Forces are the federal armed forces of the United States. They consist of the Army, Marine Corps, Navy, Air Force, and Coast Guard. The President of the United States is the military's overall head, and helps form military policy with the U.S. Department of Defense (DoD), a federal executive department, acting as the principal organ by which military policy is carried out. From the time of its inception, the military played a decisive role in the history of the United States. A sense of national unity and identity was forged as a result of victory in the First Barbary War and the Second Barbary War. Even so, the Founders were suspicious of a permanent military force. It played an important role in the American Civil War, where leading generals on both sides were picked from members of the United States military. Not until the outbreak of World WarII did a large standing army become officially established. The National Security Act of 1947, adopted following World WarII and during the Cold War's onset, created the modern U.S. military framework; the Act merged previously Cabinet-level Department of War and the Department of the Navy into the National Military Establishment (renamed the Department of Defense in 1949), headed by the Secretary of Defense; and created the Department of the Air Force and National Security Council. - The Army of the Ohio was the name of two Union armies in the American Civil War. The first army became the Army of the Cumberland and the second army was created in 1863. - The United States Army (USA) is the largest branch of the United States Armed Forces and performs land-based military operations. It is one of the seven uniformed services of the United States and is designated as the Army of the United States in the United States Constitution, Article 2, Section 2, Clause 1 and United States Code, Title 10, Subtitle B, Chapter 301, Section 3001. As the largest and senior branch of the U.S. military, the modern U.S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (17751783)before the U.S. was established as a country. After the Revolutionary War, the Congress of the Confederation created the United States Army on 3 June 1784, to replace the disbanded Continental Army. The United States Army considers itself descended from the Continental Army, and dates its institutional inception from the origin of that armed force in 1775. - The Army of the United States or Armies of the United States is the legal name of the "land forces of the United States" (United States Constitution, Article 2, Section 2, Clause 1 and United States Code, Title 10, Subtitle B, Chapter 301, Section 3001) and has been used in this context since at least 1841, as in the title: "General Regulations for the Army of the United States". The Army, or Armies of the United States includes: the Regular Army, Army National Guard, and the Army Reserve, (as well as any volunteer or conscripted forces). - The Battle of Perryville, also known as the Battle of Chaplin Hills, was fought on October 8, 1862, in the Chaplin Hills west of Perryville, Kentucky, as the culmination of the Confederate Heartland Offensive (Kentucky Campaign) during the American Civil War. Confederate Gen. Braxton Bragg's Army of Mississippi initially won a tactical victory against primarily a single corps of Maj. Gen. Don Carlos Buell's Union Army of the Ohio. The battle is considered a strategic Union victory, sometimes called the Battle for Kentucky, since Bragg withdrew to Tennessee soon thereafter. The Union retained control of the critical border state of Kentucky for the remainder of the war. - William Rufus Terrill ( April 21 , 1834 -- October 8 , 1862 ) was a United States Army soldier and general who was killed in action at the Battle of Perryville during the American Civil War . His Confederate brother was also killed during the same war , making the Terrills one of the few sets of American brothers killed in action while commanding brigades . - The Continental Army was formed by the Second Continental Congress after the outbreak of the American Revolutionary War by the colonies that became the United States of America. Established by a resolution of the Congress on June 14, 1775, it was created to coordinate the military efforts of the Thirteen Colonies in their revolt against the rule of Great Britain. The Continental Army was supplemented by local militias and troops that remained under control of the individual states or were otherwise independent. General George Washington was the commander-in-chief of the army throughout the war. - Don Carlos Buell (March 23, 1818November 19, 1898) was a United States Army officer who fought in the Seminole War, the Mexican-American War, and the American Civil War. Buell led Union armies in two great Civil War battlesShiloh and Perryville. The nation was angry at his failure to defeat the outnumbered Confederates after Perryville, or to secure East Tennessee. Historians concur that he was brave and industrious, and a master of logistics, but was too cautious and too rigid to meet the great challenges he faced in 1862. Buell was relieved of field command in late 1862 and made no more significant military contributions. - There were three organizations known as the Army of Mississippi in the Confederate States Army during the American Civil War. (This name is contrasted against Army of the Mississippi, which was a Union Army named for the Mississippi River, not the state of Mississippi.) After reading the paragraphs above, we are interested in knowing the entity with which 'william r. terrill' exhibits the relationship of 'military branch'. Find the answer from the choices below. Choices: - army - army national guard - army reserve - confederate states army - continental army - navy - regular army - union army - united states army
A:
union army