(from Wikipedia) America's Army (also known as AA or Army Game Project) is a series of video games and other media developed by the United States Army and released as a global public relations initiative to help with recruitment. America's Army was conceived by Colonel Casey Wardynski and was managed by the U.S. Army's Office of Economic and Manpower Analysis at the United States Military Academy. Wardynski envisioned "using computer game technology to provide the public a virtual Soldier experience that was engaging, informative and entertaining."
The PC version 1.0, subtitled Recon, was first released on July 4, 2002. Since then there have been over 26 versions released with the most recent being America's Army 3. All versions have been developed on the Unreal Engine and use PunkBuster to try to prevent cheating. The game is financed by the U.S. government and distributed by free download.
America's Army has "grown in ways its originators couldn't have imagined". Dozens of government training and simulation applications using the America's Army platform have been developed to train and educate U.S. Army Soldiers. America's Army has also been used to deliver Virtual Soldiering experiences to participants at events such as air shows, amusement parks and sporting events around the country. The America's Army series has also been expanded to include versions for Xbox and Xbox 360, arcade, and mobile applications published through licensing arrangements.