The next entry in the America's Army series--Proving Grounds--will launch this year, the United States Army has announced through the game's Facebook page (via Joystiq). Gamers interested in beta testing the shooter can sign up to do so through the official Proving Grounds website.
No further information about the game or the beta was announced.
The free-to-play America's Army series, which doubles as a recruitment tool, launched in 2002. The most recent update to the series, America's Army 3, launched in June 2009.