Final answer:
All vessels operating on federally controlled waters must carry night visual distress signals during the time period from sunset to sunrise.
Step-by-step explanation:
All vessels operating on federally controlled waters must carry night visual distress signals during the time period from sunset to sunrise. This requirement is in place to ensure the safety of vessels and their occupants during nighttime operations. Night visual distress signals typically include devices such as flares, lanterns, and strobe lights that can be seen from a distance and indicate distress or the need for assistance.