Petty Officer 2nd class Paul Fuston, a Coast Guard Aids To Navigation Team San Francisco electrician’s mate, assesses a lighted structure for climbing safety prior to troubleshooting the light attached to the platform in the Sacramento Deep Water Ship Channel, Feb. 8, 2021. Aids to navigation, within the area of responsibility, are inspected once a year to provide structurally sound and properly functioning navigational signals. (U.S. Coast Guard photo by Seaman James Leedy)