John Constantine is retired US Secret Service and author of Hallways and Stairwells. This is a long-form conversation that moves from presidential protection to personal identity and back again. John spent roughly 23 years in the service, 15 of them on the Counter Assault Team, the guys in the black BDUs running motorcades and stacking up for the worst day that hopefully never comes. That particular mission, always training, always ready, almost never firing a round operationally, turns out t...