Question: How many civilians died in the war during which USS "Felicia" was acquired by the U.S. Navy?

Context articles: USS William H. Bates (SSN-680)
May 1941 Sanski Most revolt
USNS Mission San Francisco (T-AO-123)
USS Felicia (SP-642)
USNS Mission Los Angeles (T-AO-117)
World War I
Civilian casualties during Operation Allied Force
Thomas B. Hayward
USS Felicia (PYc-35)
USNS Mission Santa Ana (T-AO-137)

USS "William H. Bates" (SSN-680), a "Sturgeon"-class attack submarine, was planned to be the second U.S. Navy ship to be named USS "Redfish"—for the redfish, a variety of salmon also called blueback, sawqui, red salmon, and nerka—when the contract to build her was awarded to Ingalls Shipbuilding in Pascagoula, Mississippi, on 25 June 1968.
 However, upon the 22 June 1969 death of William H. Bates (1917–1969), the U.S. Representative from Massachusetts's 6th Congressional District (1950–1969) known for his staunch support of nuclear propulsion in the U.S. Navy, she was renamed "William H. Bates" and was laid down on 4 August 1969 as the only ship of the U.S. Navy to have borne the name.
 The reason for her naming by then-Secretary of the Navy John Chafee, breaking with a long-standing Navy tradition of naming U.S. Navy attack submarines for sea creatures, was best summed up by Admiral Hyman Rickover, the then-director of the Navy's nuclear reactors program, with the pithy comment that, "Fish don't vote!"
The May 1941 Sanski Most revolt (also known as the "Đurđevdan uprising" (Serbian: Ђурђевдански устанак ) or the "rebellion of the Sana peasants" (Serbian: Побуна санских сељака ) occurred near the town of Sanski Most in what was at the time Axis-occupied Yugoslavia.
 The Serb population revolted against oppression by the Ustaše regime, the rulers of the Independent State of Croatia who were sponsored by Nazi Germany.
 Many civilians died during the three days of hostilities.
USNS "Mission San Francisco" (T-AO-123) was a "Mission Buenaventura"-class oiler that served in the United States Navy.
 The ship was originally intended as USS "Contoocook" (AO-104) for the U.S. Navy but her acquisition was canceled.
 The ship, a Type T2-SE-A3 tanker, was completed as SS "Mission San Francisco" and delivered after the end of World War II.
 The tanker was acquired by the U.S. Navy in 1947 as USS "Mission San Francisco" (AO-123), but was transferred to the Military Sea Transport Service (MSTS) upon its creation in 1949.
 During a second stint with the MSTS that began in 1954, "Mission San Francisco" collided with the freighter "Elna II" in the Delaware River coast and was declared unsalvageable by the U.S. Navy.
 The ship was one of two U.S. Navy vessels named for the Franciscan mission of San Francisco de Asís located in San Francisco, California.
USS "Felicia" (SP-642) was a yacht acquired by the U.S. Navy during World War I.
 She was outfitted and armed by the Navy as a patrol craft, and was assigned to patrol the New England waters.
 Her task of protecting ships from German submarines was interrupted by her collision with a submarine.
 Post-war she was reconfigured to her civilian condition, and was sold in 1919.
USNS "Mission Los Angeles" (T-AO-117) was a "Mission Buenaventura"-class oiler that served in the United States Navy.
 The ship was originally intended as USS "Conecuh" (AO-103) for the U.S. Navy but her acquisition was canceled.
 The ship, a Type T2-SE-A3 tanker, was completed as SS "Mission Los Angeles" and delivered after the end of World War II.
 The tanker was acquired by the U.S. Navy in 1948 as USS "Mission Los Angeles" (AO-117), but was transferred to the Military Sea Transport Service upon its creation in 1949.
 The ship was named for Nuestra Señora Reina de los Angeles Asistencia (a "sub-mission" to Mission San Gabriel Arcángel, one of the twenty-one California missions), she was the only U.S. Naval Vessel to bear the name.
World War I (WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
 More than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history.
 Over nine million combatants and seven million civilians died as a result of the war (including the victims of a number of genocides), a casualty rate exacerbated by the belligerents' technological and industrial sophistication, and the tactical stalemate caused by gruelling trench warfare.
 It was one of the deadliest conflicts in history, and paved the way for major political changes, including revolutions in many of the nations involved.
 Unresolved rivalries still extant at the end of the conflict contributed to the start of the Second World War only twenty-one years later.
Many human rights groups criticised civilian casualties resulting from military actions of NATO forces in Operation Allied Force.
 Both Serbs and Albanians were killed in 90 Human Rights Watch-confirmed incidents in which civilians died as a result of NATO bombing.
 It reported that as few as 489 and as many as 528 Yugoslav civilians were killed in the NATO airstrikes.
 "There is always a cost to defeat an evil," said NATO spokesman Jamie Shea, "It never comes free, unfortunately.
 But the cost of failure to defeat a great evil is far higher."
 He insisted NATO planes had bombed only "legitimate designated military targets," and if more civilians had died it was because NATO had been forced into military action.
 He then defended this notion by stating, "NATO does not attack civilian targets, we attack exclusively military targets and take every precaution to avoid inflicting harm on civilians."
Admiral Thomas Bibb Hayward (born May 3, 1924) was Chief of Naval Operations (CNO) for the United States Navy from July 1, 1978, until June 30, 1982, after which he retired from military service.
 Shortly after the commencement of World War II, he enlisted in the U.S. Navy V-5 aviation program and was called to active duty as a naval aviation cadet in 1943, anticipating that he would shortly be flying combat in the South Pacific.
 However, when roughly halfway through the flight training syllabus, he competed for and was accepted to attend the U.S. Naval Academy at Annapolis, Maryland, to position himself for a career in the U.S. Navy at war's end.
 He graduated from the Academy in July, 1947 and was assigned to the USS Antietam (CV-36) as an engineering officer.
 United States Naval Academy.
 USS Antietam (CV-36), In 1949 he returned to flight training at Pensacola, Florida,and received his United States Naval Aviator wings in July 1950.
 The Korean War having begun, then as Lieutenant junior grade, he reported to Fighter Squadron Fifty-One (VF-51) and flew from the decks of the USS Essex (CV-9) and USS Valley Forge (CV-45), accumulating 146 combat missions and was awarded the Distinguished Flying Cross, ten Air Medals, and two Navy Commendation Medals with Combat "V" for Valor.
USS "Felicia" (PYc-35) was a yacht acquired by the United States Navy during World War II.
 "Felicia" was outfitted as a patrol craft by the Navy, and was assigned to patrol the New England waters.
 She was based out of Newport, Rhode Island until 16 December 1943 when she was based out of Boston, Massachusetts, as a training ship for naval cadets at Harvard University.
 Post-war she was decommissioned and transferred to the Maritime Commission.
USNS "Mission Santa Ana" (T-AO-137) was a "Mission Buenaventura"-class oiler that served in the United States Navy.
 The ship was originally intended as USS "Concho" (AO-102) for the U.S. Navy but her acquisition was canceled.
 The ship, a Type T2-SE-A3 tanker, was completed as SS "Mission Santa Ana" and delivered after the end of World War II.
 The tanker was acquired by the U.S. Navy in 1948 as USS "Mission Santa Ana" (AO-137), but was transferred to the Military Sea Transport Service upon its creation in 1949.
 The ship was named for the Santa Ana "Estancia" (a station of Mission San Juan Capistrano, one of the twenty-one California missions), she was the only U.S. Naval Vessel to bear the name.