Day of Infamy [official site], the Insurgency mod unashamedly based on Valve’s WW2 FPS Day of Defeat, is becoming a standalone commercial game – with Valve’s blessing. Insurgency devs New World Interactive started Day of Infamy as a free mod made with the help of community members, releasing the first version earlier this year. Now they’re expanding it into a full and proper standalone game on the Source Engine, and with Valve’s support they’re even making a few levels based on ones from Day of Defeat. It’ll start on Steam Early Access next month. Here’s the announcement trailer: