A Secret Service agent stands guard as US President Barack Obama answers questions during a town hall event at Benedict College in Columbia, South Carolina, March 6, 2015.SAUL LOEB/AFP/Getty Images ...

Add Yahoo as a preferred source to see more of our stories on Google. A Secret Service agent stands guard as US President Barack Obama answers questions during a town hall event at Benedict College in ...

First families get their Secret Service code names at the very beginning of a presidential campaign. Presidents get to choose from a list provided by the White House Communications Agency. The code ...

The practice of naming military operations began with the German General Staff during World War I, primarily to maintain secrecy and aid in operational planning. Military operations across the world ...