201117-N-OA391-1002 SAN DIEGO, Calif. (Nov. 17, 2020) Construction Mechanic 2nd Class Andrew Yancy, Construction Mechanic 2nd Class Michael Saldana, and Equipment Operator 3rd Class Enis Pesina assigned to Naval Mobile Construction Battalion FOUR (NMCB-4) guide a vibrodriver used for pile driving onto a timber mat. NMCB-4 is conducting pile driving for a Short Approach Lighting System for Naval Air Station North Island. Seabees are the expeditionary engineering and construction experts of the naval service providing task-tailored, adaptable and combat-ready engineering and construction forces that deploy to support global Navy objectives. (U.S. Navy photo by Engineering Aide 2nd Class Vincent Paul Arnuco/ Released)