SAN DIEGO (Dec. 28, 2021) Machinist's Mate (Nuclear) 1st Class Kayla Matos, from Brooklyn, N.Y., receives a COVID-19 booster shot in the hangar bay aboard the aircraft carrier USS Abraham Lincoln (CVN 72). Though not mandatory, the Navy recommends all Navy personnel receive the COVID-19 vaccine booster. (U.S. Navy photo by Mass Communication Specialist 3rd Class Lake Fultz)