I logged into Steam to play Squad for a change and discovered that Arma 3 is free to play until Monday morning. 66% off it's price over the weekend as well.
It's not a traditional arcade shooter but closer to military combat simulator - which less action and more waiting around - many don't like that aspect. On the off-chance some may find it interesting I decided to post here
EDIT: forgot to add. You can find the game from Steam.