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A veteran of the Vietnam War , much of Lomax 's adrenaline-fueled work centers around the military experience , and its gritty , unflinching depiction of the reality of war , specifically in Vietnam .
 Vietnam, Lomax, Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vietnam, Lomax, Vietnam