69492
A past debris source was the testing of anti-satellite weapons ( ASATs ) by the U.S. and Soviet Union during the 1960 s and 1970 s .
 U.S., Soviet Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U.S., Soviet Union