This is Razorworks' ENEMY ENGAGED - COMANCHE VS. HOKUM
*The* most feature-rich helicopter simulator with a realtime, non-stop theaterwide war simulation. No loading time between missions, cooperative and competitive multiplayer for up to 8 players, all playing live and in realtime on a huge countrywide map.
NOTE: This is NOT the crappy sequel EECH2, this is the original. It's needed to play the fantastic community-enhanced patch from www.eechcentral.com
This game is open-source now, but the content is not available for free. Be sure to get the latest community patch for graphics enhancements, new gameplay features, better stability, new helicopters and 3D cockpits, online multiplayer matchmaking, and much more!
Online EECH server list available at http://hoxdna.org/eech
Feature comparison between EECH2 and EECH community edition: http://www.eechcentral.com/wiki/index.php?title=Enemy_Engaged_2