228829
The airfield provided support for Army One from 1957 to 1976 for presidents Dwight Eisenhower , John F. Kennedy , Lyndon Johnson , Richard Nixon , and Gerald Ford .
 Dwight Eisenhower, John F. Kennedy, Lyndon Johnson, Richard Nixon, Gerald Ford
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dwight Eisenhower, John F. Kennedy, Lyndon Johnson, Richard Nixon, Gerald Ford