390525
The ships had General Electric steam turbo-electric drive engine s. The ships were built at various shipyards in the United States , including the Philadelphia Navy Yard and Defoe Shipbuilding Company .
 General Electric, United States, Defoe Shipbuilding Company
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 General Electric, United States, Defoe Shipbuilding Company