Question: What branch of armed forces, was the subject of "Battle Hymn of Lt. Calley" a member of?

Context paragraphs:
The Battle Hymn of Lt. Calley: "The Battle Hymn of Lt. Calley" is a 1971 spoken word recording with vocals by Terry Nelson and music by pick-up group C-Company.

Italian Armed Forces: The Italian Armed Forces (italian: "Forze armate italiane") encompass the Italian Army, the Italian Navy and the Italian Air Force.  A fourth branch of the armed forces, known as the Carabinieri, take on the role as the nation's military police and are also involved in missions and operations abroad as a combat force.  Despite not being a branch of the armed forces, the Guardia di Finanza is part of the military and operates a large fleet of ships, aircraft and helicopters, enabling it to patrol Italy's waters and to eventually participate in warfare scenarios.  These five forces have military status and are all organized along military lines, comprising a total of 350,000 men and women with the official status of active military personnel.  The President of the Italian Republic heads the armed forces as the President of the High Council of Defence established by article 87 of the Constitution of Italy.  According to article 78, the Parliament has the authority to declare a state of war and vest the necessary powers in the Government.

Battle of Calcasieu Pass: The Battle of Calcasieu Pass was a minor skirmish fought on May 6, 1864, at the mouth of the Calcasieu River in southwestern Louisiana, during the American Civil War.  It resulted in a Confederate victory.  The participants of the battle were Lt. Benjamin Loring and Lt. C. W. Lamson on the Union’s side, and Col. W. H. Griffin on the Confederate side.  The union brought along two naval vessels, the U.S.S Wave and the U.S.S Granite City.  The U.S.S Wave did not prove too effective during the battle and was captured early on, it was soon turned into a Confederate cargo ship.  The U.S.S Granite City was originally a confederate blockade vessel, but was captured in 1863 by the U.S.S Tioga (Union).  The U.S.S Granite City was now back in the hands of the Confederates.  Captain Joseph A. Brickhouse, a Confederate veteran, said, “We fought in the open prairie, bringing on the attack with four small pieces of artillery and less than 300 infantry, poorly armed, attacking in the open prairie two such boats as the Granite City and Wave - Union gunboats - and capturing them after an action of less than two hours and 40 minutes duration.”  He described his own forces (Confederate) as unprepared, and he stated that they still had an easy battle that was short in duration.  The Confederate forces in this battle were split up into five battalions.  The first battalion was Creuzbauer's Battery, 5th Texas Artillery.  Every soldier in this battalion was born in Germany, and they all migrated to the U.S during the Civil War.  The second battalion was named Griffin’s Battalion, and was led by Col. William Henry Griffin.  The third battalion was Spaight’s Battalion, led by Lt. Col. Ashley W. Spaight.  And the final one was Daly’s Battalion, the only cavalry unit in the battle.  The U.S.S Wave and the U.S.S Granite City received orders to proceed to Calcasieu Pass.  When they arrived, immediately bombed an abandoned Confederate fort at the mouth of the river.  The Gunboats were sent with money to purchase cattle from local southern farmers.  The U.S.S Granite City ended up stealing cattle and horses from multiple farms.  This prompted a Confederate attack.  The local Confederate forces arrived quietly and prepared for a night-time attack on the Union forces.  When the Union went to sleep, they let less-experienced soldiers man the guns.  The Confederates seized the opportunity and moved their cannons closer.  The cannons lined up 1,000 yards away from the gunboats, while the cavalry and foot-soldiers advanced.  Numerous cannon shells penetrated the gunboat’s hulls.  While the cavalry and foot-soldiers moved in, the artillery advanced as well, and finished off the vessels.  On May 8th, Ella Morse, a Union Supply ship did not know of the Union casualties.  Then brought moved up all the way to the other ships with supplies.  When she noticed that confederates were manning the guns it was too late.  They gunned the ship down.  The Union Forces suffered many casualties.  They lost the Ella Morse, the U.S.S Granite City, the U.S.S Wave, and the U.S.S New London.  On the other hand, the Confederates did not lose too many soldiers.  The Confederates only suffered a few men from each battalion.

William Calley: William Laws Calley Jr. (born June 8, 1943) is a former United States Army officer convicted by court-martial of murdering 22 unarmed South Vietnamese civilians in the My Lai Massacre on March 16, 1968, during the Vietnam War.  While not technically exonerated, after three and a half years of house arrest, Calley was released after a ruling by federal judge J. Robert Elliott who found that Calley's trial had been prejudiced by pre-trial publicity, denial of subpoenas of certain defense witnesses, refusal of the United States House of Representatives to release testimony taken in executive session of its My Lai investigation, and inadequate notice of the charges.  His initial conviction faced widespread public opposition both due to the campaign circumstances of civilian embedded Viet Cong, and due to Calley being singled out as the sole convicted officer in relation to the massacre.

Marines' Hymn: The "Marines' Hymn" is the official hymn of the United States Marine Corps, introduced by the first Director of USMC Band, Francesco Maria Scala.  It is the oldest official song in the United States Armed Forces.  The "Marines' Hymn" is typically sung at the position of attention as a gesture of respect.  However, the third verse is also used as a toast during formal events, such as the birthday ball and other ceremonies.  Western Illinois University uses the hymn prior to all football games.  They are the only non-military academy allowed to use the hymn.  The university has had permission to use the official nickname, mascot, and hymn of the Corps since 1927.

United States Air Force: The United States Air Force (USAF) is the aerial and space warfare service branch of the United States Armed Forces and one of the seven American uniformed services.  Initially part of the United States Army, the USAF was formed as a separate branch of the U.S. Armed Forces on 18 September 1947 under the National Security Act of 1947.  It is the most recent branch of the U.S. Armed Forces to be formed.  The USAF is the largest and one of the most technologically advanced air forces in the world.  The service articulates its core functions as Nuclear Deterrence Operations, Air Superiority, Space Superiority, Cyberspace Superiority, Command and Control, Global Integrated ISR, Global Precision Attack, Special Operations, Rapid Global Mobility, Personnel Recovery, Agile Combat Support, and Building Partnerships.

Rank Pay: Rank Pay is a scheme implemented by the Rajiv Gandhi led Indian National Congress (I) Government in 1986, in the wake of 4th Central Pay Commission(4CPC), that reduced the basic-pay, or grade pay, of seven armed armed officers ranks of 2nd Lieutenant, Lieutenant, captain, majors, lt-colonel, colonels, and brigadiers, and their equivalent in the air-force and the Indian Navy by fixed amounts designated as 'rank-pay'.  The reduction in the basic-pay, the established basis of determining rank equivalences between armed forces officers and civilian and police counterparts, altered long established historical grade-pay equivalences or parities between armed forces officers and police officer, which was an accepted principle since 1947 for determination of armed forces grade pay, and which was 'further cemented' in 1973, by the 3 Central Pay Commission(3CPC).  The reduction in grade-pay apart from causing asymmetries in rank equivalence between the officers from the Indian police service and armed forces affected the basic pay, allowances, entitlements, promotion prospects, status, and pension of thousands of officers in the service in January 1986, and the decades after that.  In 2012, reduction in armed forces grade-pay, which was a subject of litigation since 1994, was declared illegal by the Supreme Court of India, which in a landmark judgement ordered the government to pay arrears to the more than 20,000 affected officers of the armed forces.

Terry Nelson (musician): Terry Nelson Skinner (born August 24, 1947) was an American disc jockey from Russellville, Alabama, United States.  Together with a group of studio musicians, Nelson released a single in 1971 under the name C. Company featuring Terry Nelson.  The single, entitled "Battle Hymn of Lt. Calley", was a spoken-word recording with a musical background which discussed William Calley and the incident at My Lai, for which Calley was court-martialed in 1970-71.  Originally issued on a small local label, Quickit Records, it was reissued nationally on Plantation Records in April 1971.  The single reached No. 37 on the "Billboard" Hot 100 charts and No. 49 on Hot Country Songs.

Eternal Father, Strong to Save: "Eternal Father, Strong to Save" is a hymn traditionally associated with seafarers, particularly in the maritime armed services.  Written in 1860, its author William Whiting was inspired by the dangers of the sea described in Psalm 107.  It was popularised by the Royal Navy and the United States Navy in the late 19th century, and variations of it were soon adopted by many branches of the armed services in the United Kingdom and the United States.  Services who have adapted the hymn include the Royal Marines, Royal Air Force, the British Army, the United States Coast Guard and the United States Marine Corps, as well as many navies of the British Commonwealth.  Accordingly, it is known by many names, variously referred to as the Hymn of Her Majesty's Armed Forces, the Royal Navy Hymn, the United States Navy Hymn (or just The Navy Hymn), and sometimes by the last line of its first verse, "For Those in Peril on the Sea".  The hymn has a long tradition in civilian maritime contexts as well, being regularly invoked by ship's chaplains and sung during services on ocean crossings.

Armed Forces Day (Poland): Armed Forces Day, known also as the Feast of the Polish Armed Forces (Polish: "Święto Wojska Polskiego" ), is a national holiday celebrated annually on 15 August in Poland, commemorating the anniversary of the 1920 victory over Soviet Russia at the Battle of Warsaw during the Polish–Soviet War.  Armed Forces Day is held in conjunction with the Day of the Assumption of the Virgin Mary, itself a separate public holiday.  The event is marked by military parades, equipment reviews, showcases and remembrances by all branches of the Polish Armed Forces across the country.  One of the most prominent events of the day is in the capital Warsaw, which hosts a large military parade through the city's center.  Originally celebrated during the Second Republic, the holiday was barred by authorities during the communist era beginning in 1947, only to be revived again in 1992.

Supporting paragraphs: Terry Nelson (musician) William Calley
Answer: Army