23381
The discovery of the new elements and the new data on neutron capture were initially kept secret on the orders of the U.S. " military until 1955 due to Cold War tensions .
 location: U.S.
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: U.S. 
Answer:
 location: U.S.