What happens to a missile silo after a launch?

Robert Salas is a retired U.S. Air Force officer who served as a nuclear missile launch officer (ICBM crew commander) at Malmstrom Air Force Base in Montana. His most notable claim centers on an incident he says occurred on March 16, 1967, when he was on duty underground at Oscar Flight, one of the missile launch control facilities. According to Salas, in the early morning hours, a security guard above ground reported seeing a glowing red oval-shaped object hovering over the front gate. Shortly