What does red light outside a house on military base mean?

A red light outside a house on a military base typically indicates that the occupants are observing a period of "quiet hours" or are unavailable for visitors. It can also signify that the residents are in a state of alert or readiness, often associated with operational security. In some contexts, a red light may indicate that the house is off-limits for safety or security reasons. Always check with base guidelines for specific meanings, as interpretations can vary.