Time Troopers

This mind-bending collection of time-travel stories includes some of the most critically praised authors of classic sci-fi (Poul Anderson, Robert A. Heinlein, Robert Silverberg, Gene Wolfe), the majority of them white. A captain protects the galaxy’s borders from outworld berserkers that are more out of this world than she ever expected in Christopher Ruocchio’s “The Archaenaut.” In Keith Laumer’s “The Long Remembered Thunder,” a secret agent’s mission leads him to a man who has fought in a long alien war. In Poul Anderson’s “Delenda Est,” the Time Patrol works to prevent the past from being changed by dodgy time travelers; but when the patrol goes forward in time, they find a world they don’t recognize. In all, a collection mixing swashbuckling space adventures, crimes against time, and even sf/Western, whose scope ranges from futuristic to Paleolithic.