"Clancy pointed to the ambush drill as a reminder of what is at stake for each Secret Service trainee. The exercise takes place in a mock village at the intersection of two roads, 15th street and Clint Hill Way.
Hill, as all Secret Service personnel must know, is the legendary agent who was on the detail assigned to protect President John F. Kennedy in Dallas on November 22, 1963. The agent's agony of losing a commander-in-chief to an assassin...'s bullet was immortalized in the Clint Eastwood film based on Hill's life, "In the Line of Fire."
Clancy said he still speaks to Hill and other former special agents in charge of the Secret Service every year.
"I always think about Clint Hill and all of our people should because you never what's going to happen at any time," Clancy said."
http://www.cnn.com/2015/07/06/politics/secret-service-director/