Extremely keen (6)
(Other definitions for gung ho that I've seen before include "Extremely enthusiastic" , "Stupidly jingoistic" , "Overly zealous" , "Very enthusiastic, keen as mustard" , "Over-zealous to gun hog down" .)
(Other definitions for gung ho that I've seen before include "Extremely enthusiastic" , "Stupidly jingoistic" , "Overly zealous" , "Very enthusiastic, keen as mustard" , "Over-zealous to gun hog down" .)