Extremely random fact about these tours. First, they are super fun. But second, if the person taking the tour is a federal employee (or potentially federal contractor) with a security clearance, you MUST report these tours to your security team as “international travel”. Depending on your agency rules, you may need to get approval ahead of time. It’s a random thing that people don’t necessarily think about, but when you go inside you are, technically, leaving the United States.
(Sorry for the random thread hijack OP)