Since July, the U.S. Army has quietly joined the video game business. Its new product, "America's Army," is hot. More than 950,000 users have already registered online, and countless others have obtained the video game from its many recruiting offices nationwide Each player must first make it through boot camp, where they learn how to fire Army-issued machine guns and rifles. It's your typical basic training, and it's long before the serious play begins. The real fun, for most users, is in what the video game industry calls "the first person shooter." In the second half of the game, the...