Asian ethnicity appeared initially to be a risk factor, too. The Army asks recruits to identify themselves as white, black,
Asian, Native American, or other. So U.S. soldiers who call themselves Asian might have ancestors from China, Japan, Korea,
Vietnam, India, Pakistan, or other countries—covering a wide geographic, genetic, and cultural swath. They might be born in
the United States or they might be immigrants, adding another variable to their background.