Delta Force is the start of a long running series that originally released back in 1998. Delta Force gave a hybrid of the more action packed shooters and the more tactical Rainbow Six. When starting a game you could cycle through a few appearance options for your face, choose your loadout, and then start one of the campaigns that would have you in a large open area where you would have to complete your objectives. Environments put you in deserts, jungles, snow, etc and the scoped weapons allowed you to fight targets at long range. Night missions allow you to make use of night vision and some stealth could be used if you sneak up and attack enemies with a knife. Both you and enemies could be killed in one hit, keeping the damage model from more tactical shooters but allowing you much more accuracy with your weapon, faster movement, and the ability to fight your enemies alone. Some missions did have other allied soldiers on the battlefield but they were often killed and you didn't need them like you would in other similar games. The game is somewhat hard to recommend now when you have titles like Ghost Recon, Operation Flashpoint, ARMA, etc but if playing through older games that tried something a bit different interests you then it's not going to cost much.