I deliberately dug my heels into the concrete floor of the corridor of the Pentagon. The steel plates on the heels of my black uniform boots heralded my approach with sharp anvil sounds as I marched confidently toward the unmarked door five hundred feet ahead. What was that expression used by Earth people of the 20th century? I shifted back through my training, shuffled through the facts about Earth's past history with which I had been indoctrinated, searching for the word. Assassin! That was it