Roberto M. Saldanha da Costa, 86th Airlift Wing senior host nation advisor, helps a customer over the phone at Ramstein Air Base, Germany, Dec. 3, 2020. Host nation relations have been crucial during COVID-19, as both U.S. military and German leadership have worked together to confront the pandemic and cooperatively establish safety guidelines. (U.S. Air Force photo by Senior Airman John R. Wright)