In America's Army 3, Every Detail CountsTM and as a result, the game has more authentic military elements including training, technology, weapons, and audio than any other military game. Built on Unreal Engine 3, AA3 delivers stunningly realistic environments, lighting effects, animations, and team-based experiences so that America's Army players can experience how Soldiers train, live, and advance in the Army. Players are bound by Rules of Engagement (ROE) and gain experience as they navigate challenges in team-based, multiplayer, force-on-force operations. In the game, a player's actions and demonstrated Army values are integral to successful mission accomplishment and affect a player's career progression.

The game is launching with five different environments, each with three different mission scenario options for a total of 15 different map/mission combinations. Initially, the core of the gameplay focuses on an Infantry Soldier (11B). Players first complete Basic Combat Training and then progress to Advanced Individual Training for a variety of specialized roles that the Infantry Soldier performs, such as Advanced Rifleman, Automatic Rifleman, Squad Designated Marksman, and Grenadier. This advanced training allows players to unlock new abilities and gear, customize their gear and equipment loads, increase their in-game skill level, and progress in their Army careers.