Falcon 4.0: Allied Force (F4AF) is an F-16 based combat flight simulator released by Lead Pursuit in 2005. The game is based around a realistic simulation of the Block 50/52 F-16 Fighting Falcon in a series of missions in the Balkans. The game engine is based on the source code of the original 1998 Falcon 4.0 from MicroProse, and consists largely of a collection of improvements from the official patches and extensive Falcon modding community. Allied Force also introduced several major new features and significant improvements in realism and stability. Gameplay Falcon 4.0: Allied Force is a detailed simulation; like other simulations, it may take the user some time to become proficient and familiar with all of its features. Allied Force comes with a 716-page manual, which can act as a "quick start" guide to flying a military jet. The game focuses primarily on learning to fly and fight in an F-16, yet also allows the user to manage all the ground and air assets in a campaign if they wish, or control and vector fighters as part of an E-3 AWACS squadron. The simulation allows the user to control the level of realism: the player can either set the realism settings on maximum, or enable options such as invulnerability and unlimited ammo; this may make the game easier for newcomers or players who wish to have a less realistic experience. A player that enables many of the realism settings must work with his wingmen, friendly assets such as AWACS, JSTARS, airborne tankers, forward air controllers, and other friendly aircraft if he wishes to be successful. The emphasis of the simulation's air combat is the use of beyond-visual-range missiles to destroy opponents many miles away, while maintaining the pilot's situational awareness. The player must therefore learn not only offensive tactics, but an ability to detect and counter a threat such as an incoming enemy missile. Due to the nature of beyond-visual-range fighting, within-visual-range (dogfighting) is rare in the game's campaign modes. There is, however, an "Instant Action" mode, where dogfighting may occur. The game provides simulations and training missions for some common situations, such as: landing during an engine flameout, basic fighter maneuvers (BFM), navigation using on-board instruments, avoiding surface to air missiles (SAMs), and deploying various weapons against air and ground targets. Dogfight mode allows the player to set up a situation in which dogfighting will take place. This