During 2008, United Tian Mu monthly magazine published a story about Charlie Hoppe, who was a 22 year old Intelligence Officer when he arrived at USTDC in 1956. He and his wife returned to Taipei in 2008 for a visit and he brought the photo shown below with him. Charlie took the photo in 1957 and it shows the gate at the entrance of TDC as it appeared at that time. Below that is a photo of the gate as it appeared during my tour in 1973-74. Just to the left of these gates was Hsinsheng North Road.
Many thanks to Ken A. (Linkou vet) and Les D. for providing these images.