gung-ho
From Longman Dictionary of Contemporary Englishgung-hogung-ho /ˌɡʌŋ ˈhəʊ $ -ˈhoʊ/ adjective informal ENTHUSIASTICvery eager to do something dangerous or violent The sporting opportunities here should suit the most gung-ho of tourists.Origin gung-ho (1900-2000) Chinese gonghe, from jongguo gongye hozo she “Chinese Industrial Cooperatives Society”, used as a battle cry (meaning "work together") by U.S. soldiers in World War II