Google’s Street View has been at the center of privacy concerns, so this is just the latest story in that chain … but why would guards let them onto a base in the first place?A person familiar with the matter at Fort Sam Houston said a base official twice granted Google access, but only after he was assured that Google would not videotape or photograph the historic base, which serves as a medical-training and support post. The official had believed an online map would be useful to guide visitors. “Unfortunately,