The ensuing conversation at Fort Benning, Ga., took more than an hour, and cut into an already short night of sleep, she recalled in a question-and-answer interview on Facebook with fellow alumnae of the U.S. Military Academy at West Point, N.Y. She brought up the issue while observing that both male Ranger instructors and students were struggling to adapt to the idea the service was opening the legendarily difficult school to women for the first time, she said.