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Ka-Bar ( trademarked as KA-BAR , capitalized ) is the contemporary popular name for the combat knife first adopted by the United States Marine Corps in November 1942 as the 1219C2 combat knife ( later designated the USMC Mark 2 combat knife or Knife , Fighting Utility ) , and subsequently adopted by the United States Navy as the U.S. Navy utility knife , Mark 2 .
 United States Marine Corps, USMC, United States Navy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 United States Marine Corps, USMC, United States Navy