Air-to-Air Combat

The Art of the Kill - Classic Falcon Era video explaining the basic concepts of close range air-to-air combat.

The greatest mustache in the USAF explaining how to kill a man in "The Art of the Kill"

Fighter Combat by Richard A. Shaw

Fighter Combat: Tactics and Maneuvering - 80's era book on BFM/BVR combat, placing it in the perfect timeframe for applicability to DCS World fights.

TAWDCS;s Radar simulator - Great for visualizing how RADAR works.

TAWDCS's RADAR simulator showing how radar works in 3D space

Mudspike's F-15C Combat Guide for Beginners

Ktulu2's BVR Guide - F-15C centric, but many of the concepts work across all aircraft.