Tech. Sgt. Brian De Luca and Guatemalan air force Cabo Especialista Luis Alberto Gonzalez Prado watch Guatemalan navy Marinero Segundo, Melvin Ivan Garcia Alvarado, perform a radio check during classroom instruction Mar. 11, 2014, at La Aurora air base, Guatemala. Seminars conducted by the 571st Mobility Support Advisory Squadron highlighted aircraft maintenance, aircraft security, radio communications and intelligence. De Luca is a 571st MSAS communications air adviser. (U.S. Air Force photo/Staff Sgt. Christopher Carranza)