ATLAS-I, better known as Trestle, was a unique electromagnetic pulse generation and testing apparatus built between 1972 and 1980 during the Cold War at Sandia National Laboratories near Kirtland Air Force Base in Albuquerque, New Me…ATLAS-I, better known as Trestle, was a unique electromagnetic pulse generation and testing apparatus built between 1972 and 1980 during the Cold War at Sandia National Laboratories near Kirtland Air Force Base in Albuquerque, New Mexico.