259742
Around May 1st , 2009 , the and a screen of German Navy warships assisted approximately 200 members of the German special police unit GSG-9 in approaching the hijacked ship .
 German Navy, GSG-9
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 German Navy, GSG-9