U.S. Marine Corps Cpl. Brendan Varnum, a transmissions

U.S. Marine Corps Cpl. Brendan Varnum, a transmissions system operator with Combat Logistics Battalion 15, 1st Marine Logistics Group, explains the functions of radio equipment to Drew Cheney, a U.S. Coast Guard veteran, at the Defense Support to Civil Authorities exercise during San Francisco Fleet Week 2019 on Oct. 7, 2019. San Francisco Fleet Week is an opportunity for the Marine Corps to learn more about emergency response needs and to share their crisis response skills with civil authorities to enhance their emergency response capabilities. (U.S. Marine Corps photo by Cpl. Tia D. Carr)