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In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
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Washington (CNN) -- President Barack Obama used a Memorial Day ceremony to say it is time for America to properly welcome home Vietnam veterans and show them and their families the respect and gratitude they deserved but didn't receive decades ago. "You came home and sometimes were denigrated when you should have been celebrated," Obama said beneath a scorching sun at the Vietnam Veterans Memorial. "It was a national shame, a disgrace that should have never happened. That's why here today, we resolve that it will not happen again." The event, which launched a 13-year Vietnam War 50th anniversary commemoration, was the culmination of a day of somber events on the annual holiday honoring America's war dead.NEW: President Obama calls the denigration of Vietnam veterans a "national shame""America will be there for you," Obama tells veterans and their familiesMemorial Day launches a 13-year commemoration of the Vietnam War's 50th anniversaryObama lays a wreath to the fallen at Arlington National Cemetery 
 Question:This year marks the 50th anniversary of the _ deploying a significant military presence in Vietnam.
answer:
America


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Jose Mourinho was forced to defend new £8millon signing Asmir Begovic as Chelsea suffered a humbling 4-2 defeat to a New York Red Bulls team largely made up of youth team players and reserves on the first fixture of their US tour. Begovic had a nightmare start after coming on for the second-half for Thibaut Courtois, as Chelsea endured a calamitous period in which they conceded four goals including one scored by a 16-year-old high school kid, Tyler Adams, in a performance which Mourinho labelled a ‘disaster.’ The Chelsea manager claimed that the fact they had only trained for six days and that they had been doing double sessions accounted for the shock result, with the Red Bulls fielding a reserve side which plays in the US third division, as their first team had played in a US Open Cup fixture the night before.Chelsea were beaten 4-2 by New York Red Bulls in first America tour gameNew goalkeeper Asmir Begovic made a couple of calamitous errorsBut Jose Mourinho defended his £8m signing, saying he was tiredManager said Begovic would start next match against Paris Saint-Germain 
 Question:Begovic was also responsible for the Red Bulls' fourth goal and Mourinho said: ‘First of all I think he was tired, the same as _ and when goalkeeper are very tired, co-ordination is low, agility doesn't exist, speed reaction doesn't exist.
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Thibaut Courtois


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(CNN) The case of college football player Michael Keck has added more fuel to the fire about whether young children should play football. Despite the fact that Keck, 25, never played professional football, he was diagnosed with chronic traumatic encephalopathy, the Alzheimer's-like disease that also claimed the likes of former Chicago Bears safety Dave Duerson and former San Diego Chargers linebacker Junior Seau, and with equal severity. "I was surprised how extensive it was," said Dr. Ann McKee, professor of neurology and pathology at Boston University. She and her team have evaluated 170 brains to understand the pathology of CTE. The telltale sign of the disease is tangles of the protein tau, which takes over parts of the brain. They result from repeated hits to the head.Chronic traumatic encephalopathy results from repetitive hits to the headThe disease has symptoms that are similar to Alzheimer's44 of 55 college football players were found to have CTE 
 Question:Keck believed he suffered from _, but it cannot be diagnosed in living people.
answer:

CTE