DARPA released a anti-submarine warfare simulator and is asking for the public to ….. try to track (simulated) enemy submarines. Their goal is to collect data from as many players as possible in order to see which tactics work best (and worst). Very interesting use of crowdsourcing by a normally very closed industry.
You’re free to download and use the game even if you don’t want to submit your results. I.e. you are in control over whether or not any usage info is posted back to DARPA.