56560
On April 4 , 2008 , the U.S. Department of Homeland Security ( DHS ) released an interim final rule extending the period of OPT from 12 to 29 months for qualified F-1 non-immigrant students .
 Department of Homeland Security
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Department of Homeland Security