or Digital Combat Simulator
is one of the best military flight simulators out. I have played for over 700 hours(this only includes DCS flight time, I've played Lock on 1.0 and FC1 for 500 hours too) and I don't get bored of the series. There is a variety of aircraft and helicopters that are currently out as modules to the game which are sold seperatly. I have all the module and have tried out each and every one. The DCS modules include the A-10C, P-51D, KA-50, UH-1H Huey, MI-8 MTV2 Magnificent Eight and the TF-51D (Recon aircraft, which comes free
with DCS world).
Every DCS module has amazing detail and requires you to study on how the aircraft start up and how the aircraft functions. If you enjoy studying things before you try them out you will definetly love this sim. You can also just jump into the cockpit and mess about which is fun but the most fun is studying the sim and getting the aircraft up in the air, then the next step is employing the weapons which is even more fun. There is a module called Flaming Cliffs which is a good module for people who don't enjoy much of the study aspect of flight simulators and they can just jump in and hit a few keyboard buttons and get the plane started in less than 40 seconds.
The F-15C (New Update introduced the AFM (Advanced Flight Model) which makes the aircraft much more realistic), SU-27, SU-33, MIG-29A, MIG-29S are the flaming cliffs aircraft, these aircraft allow you to perform CAP (Combat Air Patrols), BARCAP (Barrier Combat Air Patrols) etc. Whilst the DCS: A-10C can be used for CAS (Close Air Support), FAC (Forward Air Controller) etc. Each aircraft in the game as shown above can perform various tasks but you also need to know the aircrafts limits in what roles it cannot perform, This will help you not get killed!
Overall, I Highly recommend this game if you enjoy military flight simulators and enjoy learning about how aircraft operate and how to use each aircraft weapons systems, Navigation systems etc. If you don't like the study aspect as said above you can just get the Flaming Cliffs DLC and hop into one of the faster jets and shoot some unlucky ♥♥♥♥♥♥♥ down.