This design, by Rhys Gibson, is pretty good, although I question the British spelling of theater, and I'm not sure I get the rolled-up newspaper. Is it a reference to publicity? Were TSA screeners confiscating periodicals at some point? I prefer Travis McHale's execution of the same basic concept, which can be viewed here along with the other finalists. Feel free to pick (and justify) your choice in the comments.
Gibson's inspiration, the Department of Homeland Security logo, looks like this. The old TSA logo, from before it was absorbed by DHS, looked like this. More suggested improvements here. More on the TSA here. More on Schneier here.
[Thanks to Geoff Nathan for the tip.]