Yup. I’m outside DC. Somewhere near half my software engineer (and adjacent fields) friends are under contract to either the military or NSA/CIA. Most of them with TS/poly clearances. Ask one of the what they’re working on and the most you’ll get is something like “dig data on platform X”.

If platform X is something public, they could talk about the platform. But, talking about any project specifics, implementation details, etc would be a felony.