50076
Infantry master gunnery sergeants serve as the operations chief in the headquarters of an infantry battalion or higher level organization ( viz. , Marine Expeditionary Unit , regiment , Marine Expeditionary Brigade , division , Marine Expeditionary Force ) and follow the same verbal address protocol as master sergeants but are commonly referred to as " Master Guns " , or " Master Gunny " .
 Marine Expeditionary Unit, Marine Expeditionary Brigade, Marine Expeditionary Force, Master Guns, Master Gunny
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marine Expeditionary Unit, Marine Expeditionary Brigade, Marine Expeditionary Force, Master Guns, Master Gunny