I saw that too but noticed that the claim didn't have a reference. That is what brought me to the NRO PDF, which ties the designation KH of the satellites to th

I saw that too but noticed that the claim didn't have a reference. That is what brought me to the NRO PDF, which ties the designation KH of the satellites to the Talent Keyhole security designation on page 15 [0]. One of the confusing parts is that the early Corona didn't have a KH designation initially because the Keyhole compartment wasn't created until 1960 [1]. Maybe the Keyhole compartment's name came from the analogy? 0. https://www.nro.gov/Portals/65/documents/foia/docs/HOSR/SC-2017-00006a.pdf https://www.nro.gov/Portals/65/documents/foia/docs/HOSR/SC-2... 1. In 1960, it was broadened to cover all national aerial reconnaissance (to later include SR-71 sourced imagery) and the KEYHOLE compartment was created for satellite intelligence. https://en.wikipedia.org/wiki/Sensitive_compartmented_information#:~:text=KEYHOLE https://en.wikipedia.org/wiki/Sensitive_compartmented_inform... compartment%20was%20created