If you say that someone is gung ho, you mean that they are very enthusiastic or eager to do something, for example to fight in a battle. He has warned some of his more gung ho generals about the consequences of an invasion Senate Republicans are less gung-ho about tax cuts
very eager to do something dangerous or violent (gonghe, from jongguo gongye hozo she , used as a battle cry (meaning "work together") by U.S. soldiers in World War II)
[ 'g&[ng]-'hO ] (adjective.) 1942. From a World War II catachresis of Mandarin Chinese gōnghé (工 gōng, work + 合 hé, together), itself an acronym for gōngyè hézuòshè (工業合作社, 工业合作社 Chinese Industrial Cooperative Society).