Petty Officer 3rd Class Stephanie Horvat, a machinery technician at Coast Guard Station Annapolis, Md., tests the oil of a Coast Guard 45-foot response boat-medium using a falling ball viscosity comparator at Station Annapolis, Dec. 7, 2020. The oil from all diesel-fueled vessels is tested every morning to ensure that the vessels are able to successfully complete Coast Guard missions. (U.S. Coast Guard photo by Petty Officer 3rd Class Kimberly Reaves/Released)