Pseudonym: Terteling, Spencer O.
Bernard Barker, a colleague of Howard Hunt. Spencer O. Terteling and AMCLATTER-1 are one and the same. The cryptonym AMCLATTER-1 has been definitively identified as Bernard Barker.
8/16/60 memo from C/WH/4/PA Gerard Droller to WH/4/PA/Personnel identifies Spencer O. Terteling as AMCLATTER-1.