67045
In September 1951 , while making a low bombing run , Armstrong 's aircraft was damaged when it collided with an anti-aircraft cable , strung across a valley , which cut off a large portion of one wing .
 Armstrong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Armstrong