The NSA coordinates their efforts not only within their varying departments but also with other government agencies, along with their partners in the private sector and academia. So, your interviewer needs to gauge your interpersonal skills and how effectively you'll be able to work with those outside of the teams you've built relationships with. As they detail on their website, the NSA builds alliances "with colleagues and counterparts within NSA, with overseers, and with other IC agencies to achieve common goals, developing collaborative information and knowledge sharing networks."