In the Army's vision, the war of the future is increasingly combat by mouse clicks. It's as networked as the Internet, as mobile as a cellphone, as intuitive as a video game. The Army has a name for this vision: Future Combat Systems, or FCS. The project involves creating a family of 14 weapons, drones, robots, sensors and hybrid-electric combat vehicles connected by a wireless network. It has turned into the most ambitious modernization of the Army since World War II and the most expensive Army weapons program ever, military officials say.

It's also one of the most controversial. Even as some early versions of these weapons make their way onto the battlefields of Iraq and Afghanistan, members of Congress, government investigators and military observers question whether the Defense Department has set the stage for one of its biggest and costliest failures. At risk, they say, are billions of taxpayer dollars spent on exotic technology that may never come to fruition, leaving the Army little time and few resources to prepare for new threats.

See also DoD Transformation: Challenges and Opportunities, a recent presentation by the Comptroller General. Several other recent presentations are also available, including:

"U.S. Financial Condition and Fiscal Future Briefing," by David M. Walker, comptroller general of the United States, before the Center for Governmental Accounting Education and Research's Annual Conference, at Rutgers University, in New Brunswick, New Jersey. GAO-08-340CG, November 30.

"Saving Our Future Requires Tough Choices Today," by David M. Walker, comptroller general of the United States, on the Fiscal Wake-Up Tour at the University of Iowa in Iowa City, Iowa. GAO-08-337CG, December 3.

"America's Fiscal Future," by David M. Walker, comptroller general of the United States, before the Greater Washington Society of CPAs' Annual Not For Profit Organization Symposium, in Washington, D.C. GAO-08-339CG, December 5.