Question: Where was the musician from, who released a single  1971 under the name C. Company about a former United States Army officer convicted by court-martial of murdering 22 unarmed South Vietnamese? 

Context articles: Easter Offensive
Operation Truong Cong Dinh
Tet Offensive
Action of 1 March 1968
Terry Nelson (musician)
Operation Sea Dragon (Vietnam War)
William Calley
Viet Cong
David Truong
Operation Coronado IX

The Easter Offensive (Vietnamese: Chiến dịch Xuân hè 1972, or Mùa hè đỏ lửa, the "Red fiery summer" as romanticized in South Vietnamese literature) was a military campaign conducted by the People's Army of Vietnam (PAVN, the regular army of North Vietnam) against the Army of the Republic of Vietnam (ARVN, the regular army of South Vietnam) and the United States military between March 30 and October 22, 1972, during the Vietnam War.
 This conventional invasion (the largest offensive operation since 300,000 Chinese volunteers had crossed the Yalu River into North Korea during the Korean War) was a radical departure from previous North Vietnamese offensives.
 The offensive was not designed to win the war outright but to gain as much territory and destroy as many units of the ARVN as possible, to improve the North's negotiating position as the Paris Peace Accords drew towards a conclusion.
Operation Truong Cong Dinh, which occurred in March 1968, was an initiative of the United States and South Vietnamese military to sweep the area surrounding the Mekong Delta town of Mỹ Tho in the south of Vietnam to root out Viet Cong forces in the area, and to stop them from attacking traffic on the nearby Highway 4.
 The operation started on March 7, 1968, and lasted almost four weeks, involving the 1st and 2d brigades of the US 9th Infantry Division and the 7th Division of the Army of the Republic of Vietnam backed by South Vietnamese Regional Forces. Operations were supported by an American artillery battalion, which established a fire support base on the north bank of the Mỹ Tho River, and the Mobile Riverine Force which conducted a series of riverine and airmobile operations.
 The heaviest action occurred on the first two days; five US helicopters were shot down on the first day, and two artillery barges were sunk the day after.
The Tet Offensive (Vietnamese: "Sự kiện Tết Mậu Thân 1968" , or "Tổng tiến công và nổi dậy Tết Mậu Thân") was one of the largest military campaigns of the Vietnam War, launched on January 30, 1968, by forces of the Viet Cong and North Vietnamese People's Army of Vietnam against the forces of the South Vietnamese Army of the Republic of Vietnam, the United States Armed Forces, and their allies.
 It was a campaign of surprise attacks against military and civilian command and control centers throughout South Vietnam.
 The name of the offensive comes from the Tết holiday, the Vietnamese New Year, when the first major attacks took place.
The Action of 1 March 1968 refers to a co-ordinated attempt by four North Vietnamese trawlers to resupply the Viet Cong and the efforts of Operation Market Time elements to stop them during the Vietnam War.
 On 28 February 1968, United States Navy SP-2H Neptune aircraft on routine patrol detected a North Vietnamese SL class naval trawler heading towards the South Vietnamese coast from north of the DMZ.
 By the next morning, three more trawlers were discovered and units of Operation Market Time were deployed for a surprise interception.
 The suspect trawlers did not fly flags so it was not until the start of the engagement that their origin was discovered.
 The trawlers were steel hulled vessels, 100 feet long and armed with 57-millimeter recoilless rifles and machine guns. All four vessels were loaded with weapons and ammunition intended to be delivered to the Viet Cong.
 American and South Vietnamese forces that engaged in action included the United States Coast Guard cutters "Androscoggin" , "Point Grey" , "Point Welcome" , "Winona" , "Point Grace" , "Point Hudson" , "Point Marone" , the swift boats USS "PCF-18" , USS "PCF-20" , USS "PCF-42" , USS "PCF-43" , USS "PCF-46" , USS "PCF-47" and USS "PCF-48" , two South Vietnamese navy junks and one patrol boat.
 Two U.S. Army helicopter gunships also participated in combat as well as aircraft used to fire flares.
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.
Operation Sea Dragon occurred during the Vietnam War and was a series of American-led naval operations beginning in 1966 to interdict sea lines of communications and supply going south from North Vietnam to South Vietnam, and to destroy land targets with naval gunfire, as well as to give CIA officers in the area who had sited the targets room to withdraw to extraction zones.
 The primary purpose of Sea Dragon forces was the interception and destruction of waterborne logistic craft (WBLC), which ranged in size from large self-propelled barges down to small junks and sampans.
 United States Navy advisers were assigned to the South Vietnamese Navy (VNN) and American minesweepers assisted South Vietnamese Navy ships in carrying out patrols near the Demilitarized Zone.
 Specially modified attack helicopters were used to pursue North Vietnamese ships and disable them, leaving the ships to be boarded by American and South Vietnamese naval commandos.
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.
The Việt Cộng (] ), also known as the National Liberation Front, was a communist political organization with its own army – the People's Liberation Armed Forces of South Vietnam (PLAF) – in South Vietnam and Cambodia that fought the United States and South Vietnamese governments, eventually emerging on the winning side.
 It had both guerrilla and regular army units, as well as a network of cadres who organized peasants in the territory it controlled.
 Many soldiers were recruited in South Vietnam, but others were attached to the People's Army of Vietnam (PAVN), the regular North Vietnamese army.
 During the war, communists and anti-war activists insisted the Việt Cộng was an insurgency indigenous to the South, while the U.S. and South Vietnamese governments portrayed the group as a tool of Hanoi.
 Although the terminology distinguishes northerners from the southerners, communist forces were under a single command structure set up in 1958.
David Truong (born Truong Dinh Hung) (September 2, 1945 - June 26, 2014) was a South Vietnamese national who lived in the United States and partook in the anti-Vietnam War peace movement.
 Truong was the son of South Vietnamese politician Trương Đình Dzu, a candidate for the presidency in the 1967 elections against Nguyễn Văn Thiệu.
 Dzu advocated negotiating with the National Liberation Front for South Vietnam to end the war.
 Truong and co-conspirator Ronald Humphrey were arrested for passing diplomatic cables and classified information to Vietnam.
 They were convicted of espionage in 1978.
Operation Coronado IX was a riverine military operation conducted by the Mobile Riverine Force of the United States and elements of the Army of the Republic of Vietnam from November 1967 to January 1968 in an attempt to dismantle communist strongholds in the Mekong Delta.
 In the middle of November, clashes resulted in the capture of communist supplies and hideouts.
 During this period, the communists lost 178 men but killed only 26.
 For the next few weeks there was little contact, although some abandoned communist bunkers were destroyed and supplies captured.
 On 4 December, large engagement occurred when a communist battalion encountered a battalion of South Vietnamese marines.
 There were 266 Vietcong killed, mostly by South Vietnamese marines.
 The South Vietnamese Marines lost 40 killed, while the Americans suffered 9 dead.
 Over the next month and the Christmas period, there was only sproadic skirmishes, but at the start of the new year, there were some medium size battles in which the Americans killed a few dozen communists.
 After this there was little contact.