https://www.gamespot.com/articles/free-steam-pc-game-available-now-courtesy-of-humbl/1100-6455454/

Through Humble Bundle, you can fight for freedom on American soil in a fictional military occupation without spending a dime. As long as you have a Humble Store and Steam account, you can download the PC version of Homefront free of charge until December 9, 10AM PT.

Homefront is a first-person shooter with both a single-player campaign and multiplayer component. Its story uses elements of the real world to set the stage for the campaign where North Korea invades the United States amidst the chaos of diseases, financial collapse, and military rule in the year 2027. You take part in an organized rebellion, fueled by the sights of desperation and oppression. The game plays out like a standard FPS campaign, but memorable moments are peppered within its story.