The report is that "A branch of the U.S. Navy uses Tor for open source intelligence gathering". All this means is that they use it to obscure their origin IP ad

The report is that "A branch of the U.S. Navy uses Tor for open source intelligence gathering". All this means is that they use it to obscure their origin IP address from a website when they are collecting publicly available information (so that people don't look at their logs and see a huge navy.mil spider or the like) and has nothing to do with anti-surveillance or a sophisticated attacker being able to track them.