Question: How many of the 4,219 returned remains were not identified by name?
About the article "Korean War", section "Armistice (July 1953 – November 1954)".

Candidate passages:
During the battle, UN casualties were buried at temporary grave sites along the road.
Operation Glory took place from July to November 1954, during which the dead of each side were exchanged.
The remains of 4,167 US Soldiers and Marines were exchanged for 13,528 North Korean and Chinese dead.
In addition, 546 civilians who died in UN prisoner of war camps were turned over to the South Korean government.
After Operation Glory, 416 Korean War "unknowns" were buried in the Punchbowl Cemetery.
According to a Defense Prisoner of War/Missing Personnel Office (DPMO) white paper, 1,394 names were also transmitted during "Operation Glory" from the Chinese and North Koreans, of which 858 proved to be correct.
The 4,167 returned remains were found to be 4,219 individuals, of whom 2,944 were found to be Americans, with all but 416 identified by name.
Of the 239 Korean War unaccounted for, 186 are not associated with the Punchbowl unknowns.
From 1990 to 1994 North Korea excavated and returned more than 208 sets of remains which possibly include 200 to 400 US servicemen, but very few have been identified due to the co-mingling of remains.
From 2001 to 2005, more remains were recovered from the Chosin Battle site, and around 220 were recovered near the Chinese border between 1996 to 2006. 
After their retreat in 1950, dead Soldiers and Marines were buried at a temporary military cemetery near Hungnam, North Korea.
During Operation Glory, which occurred from July to November 1954, the dead of each side were exchanged; remains of 4,167 US soldiers/Marines were exchanged for 13,528 North Korean/Chinese dead.
In addition 546 civilians who died in United Nations prisoner of war camps were turned over to the South Korean Government.
After "Operation Glory" 416 Korean War "unknowns" were buried in the Punchbowl Cemetery.
According to one report, 1,394 names were also transmitted during "Operation Glory" from the Chinese and North Koreans (of which 858 names proved to be correct); of the 4,167 returned remains were found to be 4,219 individuals of whom 2,944 were found to be Americans of whom all but 416 were identified by name.
Of 239 Korean War unaccounted for: 186 not associated with Punchbowl unknowns (176 were identified and of the remaining 10 cases four were non-Americans of Asiatic descent; one was British; three were identified and two cases unconfirmed).
Fifty-seven years after the Korean War, remains of two of the "Punchbowl unknowns" were identified—both from the 1st Marine Division.
One was Pfc.
Donald Morris Walker of Support Company/1st Service Battalion/1st Marine Division who was KIA December 7, 1950 and the other was Pfc.
Carl West of Weapons Company/1st Battalion/7th Regiment/1st Marine Division who was KIA December 10, 1950.
In 2011 remains of an unknown USAF pilot from Operation Glory were identified from the "Punchbowl Cemetery"; POW remains from "Operation Glory" were also identified in 2011.
From 1990 to 1994, North Korea excavated and turned over 208 sets of remains—possibly containing remains of 200–400 US Servicemen—but few identifiable because of co-mingling of remains.
In 2011 remains were identified.
From 1996 to 2006, 220 remains were recovered near the Chinese border.
In 2008, a total of 63 were identified (26 World War II; 19 Korea; 18 Vietnam) (Among those identified: January 2008 remains of a Michigan soldier.
In March 2008, remains of an Indiana soldier and an Ohio soldier were identified).
According to a report June 24, 2008, of 10 Korean War Remains disinterred from the "Punchbowl Cemetery" six have been identified.
From January to April 2009, a total of twelve Unknowns have been identified—three from World War II; eight from Korean War; one from Vietnam.
In 2011 remains returned in 2000 were identified. 
Armistice (July 1953 – November 1954).
The on-again, off-again armistice negotiations continued for two years, first at Kaesong (southern North Korea), then relocated at Panmunjom (bordering the Koreas).
A major, problematic negotiation point was prisoner of war (POW) repatriation.
The PVA, KPA, and UN Command could not agree on a system of repatriation because many PVA and KPA soldiers refused to be repatriated back to the north, which was unacceptable to the Chinese and North Koreans.
In the final armistice agreement, signed on 27 July 1953, a Neutral Nations Repatriation Commission was set up to handle the matter.
In 1952, the US elected a new president, and on 29 November 1952, the president-elect, Dwight D. Eisenhower, went to Korea to learn what might end the Korean War.
With the United Nations' acceptance of India's proposed Korean War armistice, the KPA, the PVA, and the UN Command ceased fire with the battle line approximately at the 38th parallel.
Upon agreeing to the armistice, the belligerents established the Korean Demilitarized Zone (DMZ), which has since been patrolled by the KPA and ROKA, US, and Joint UN Commands.
The Demilitarized Zone runs northeast of the 38th parallel; to the south, it travels west.
The old Korean capital city of Kaesong, site of the armistice negotiations, originally lay in the pre-war ROK, but now is in the DPRK.
The United Nations Command, supported by the United States, the North Korean People's Army, and the Chinese People's Volunteers, signed the Armistice Agreement on 27 July 1953 to end the fighting.
The Armistice also called upon the governments of South Korea, North Korea, China and the United States to participate in continued peace talks.
The war is considered to have ended at this point, even though there was no peace treaty.
North Korea nevertheless claims that it won the Korean War.
After the war, Operation Glory (July–November 1954) was conducted to allow combatant countries to exchange their dead.
The remains of 4,167 US Army and US Marine Corps dead were exchanged for 13,528 KPA and PVA dead, and 546 civilians dead in UN prisoner-of-war camps were delivered to the ROK government.
After Operation Glory, 416 Korean War unknown soldiers were buried in the National Memorial Cemetery of the Pacific (The Punchbowl), on the island of Oahu, Hawaii.
Defense Prisoner of War/Missing Personnel Office (DPMO) records indicate that the PRC and the DPRK transmitted 1,394 names, of which 858 were correct.
From 4,167 containers of returned remains, forensic examination identified 4,219 individuals.
Of these, 2,944 were identified as American, and all but 416 were identified by name.
From 1996 to 2006, the DPRK recovered 220 remains near the Sino-Korean border.
Mattituck is a hamlet and census-designated place (CDP) in Suffolk County, New York, United States.
The population was 4,219 at the 2010 census.
Located in the Town of Southold, Mattituck CDP roughly corresponds to the hamlet by the same name. 
Following the signing of the Korean Armistice Agreement in July 1953, the United Nations Command sought to recover bodies interred in North Korean territory.
Cemeteries for POWs in North Korea were established at 16 POW camps.
From September to October 1954, the resulting exchange of casualties, dubbed Operation Glory, between United Nations forces and the North Koreans resulted in 4,219 remains being recovered, of which 1,275 were non-US casualties.
(Also exchanged were the remains of approximately 14,000 North Korean and Chinese casualties.)
From 1950 to 1954, approximately 11,000 casualties were interred at UNMC, which was maintained by the United States Army Graves Registration Agency.