92879
History Cam Ranh Airport was built by the United States Army during the Vietnam War , and operated by the United States Air Force for military purposes as Cam Ranh Air Base .
 Cam Ranh, United States Army, Vietnam, United States Air Force, Cam Ranh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cam Ranh, United States Army, Vietnam, United States Air Force, Cam Ranh