Members of the Secret Service arrive to board Air Force One to escort US President Donald Trump at Andrews Air Force Base May 4, 2017 in Maryland. Image credit: BRENDAN SMIALOWSKI/AFP via Getty Images. Amid scrutiny into the US Secret Service, a look at how the agency uses technology The Secret Service is typically mum about the technology it deploys to protect presidents, but plenty is publicly disclosed. 4 hours ago By Rebecca Heilweil Caroline Nihill