I should point out a few things, just as an explanation then.
The system is RTD with some complexities.
1. It's stat and skill based, with stats for basic physical abilities and skills for particular knowledge. Like shooting a gun.
2. You can get +1 to +3 on any stat or skill, however rather than being D6+1, thus removing the chance of a 1, it instead expands the 5, so to speak. So standard rtd has 5 as a perfect success. with +1 you would have 4-5 as a perfect success. At+3 You have an 85ish% chance of total success or overshot success, with a 15% chance of horrible failure. No matter how good you get, that 1 never goes away.
3. Damage is handled a little different than most systems: You have three dice, Physical, Mental and Life. Physical is the dice you roll for stats and represents your stamina and non-lethal damage, mental is for skills and represents how sharp, focused and sane you are. Life is sort of a combo luck/HP, and it is used for lethal damage, like being shot at. Anything that could make you tired, hurt your mind, or injure you physically has a "Risk" rating between 2-10. When you are subjected to damage, you roll your dice for whatever kind of damage it is, and if you roll over the risk rating, you are unhurt. If you fail, get -1's on that dice equal to the amount you fail by. If a dice reaches a point where you're rolling 0 or less, then you become incapacitated, crazy or dead. Each dice can gain bonuses, but these bonuses don't effect the roll, they just act as a buffer, preventing damage from hurting your rolls for a time.
4. Risk can often increase if the same source continues to force you to make risk rolls. That guy with the knife might be risk 2 to start with, but after a few turns, especially turns where you fail melee rolls but manage to succeed on the life roll, his risk might raise to the point that he can kill instantly. The same goes for you though. Removing threats quickly is of vital importance.
5. The game is mission based, with objectives to complete per mission. Sometimes you will be alone but sometimes you will be fighting as part of a larger force. In larger force missions, the other forces are simulated and it is possible to win the mission even if you do shit, or lose even if you do well. But your actions WILL influence the other forces, so if you do well and still lose, its because things went extremely poorly for the other people.
6. Starting gear is based on "Packages" which are like starting classes. But your stats and skills are yours to choose.
7. You're controlled by an NPC in command. No human commanders, beyond those that feel like leading groups. Well, you're controlled assuming you have someone with a radio...
8. You are human and always will be. The things you fight may not be.