Standing Watch
Most anyone who has read war novels or seen films with military themes, is familiar with some version of the following scene. It features a soldier who has drawn guard duty, and hears a noise while on watch, betraying the approach of another person. Sentry: “Halt! Who goes there?” [The challenge is answered by the potential intruder.] Sentry: “Are you friend or foe?” Intruder: “Friend.” Sentry: “Approach and be recognized.” [Intruder emerges from the shadows and presents himself/herself to the guard.] Sentry:…