JHU APL does tons, well primarily, highly sensitive defense contracting work. For instance, you can actually head on over right now to Linkedin and apply for their &quot;Combat Systems Kill Chain Engineer&quot; position. [1] Security is thus a big requirement.<p>From Wikipedia: &quot;APL is primarily a defense contractor. It serves as a technical resource for the Department of Defense, NASA, and other government agencies.&quot;<p>There is a very strained relationship with some parts of the JHU community due to this. At the offices where they control the Hubble Space Telescope for instance there is a deli with a tip jar for, tongue in cheek, COINTELPRO.<p>[1] <a href="https:&#x2F;&#x2F;www.linkedin.com&#x2F;jobs2&#x2F;view&#x2F;70728662?trk=jobs_jserp_job_listing_text" rel="nofollow">https:&#x2F;&#x2F;www.linkedin.com&#x2F;jobs2&#x2F;view&#x2F;70728662?trk=jobs_jserp_...</a>