Guess Who?
by Philip E. High
New Worlds Science Fiction, Vol. 19, No. 56 (February 1957), 88-99.
SF short story in which High attempts to show up the military’s hard-ball pre-emptive aggression while also postulating how to deal with a ruthless species of telepathic shape-changers—an odd juxtaposition, as the latter come across as no better than the former.