From the US Army Web site: "Why the Strong Lose"

"Target destruction is insufficient and perhaps even counterproductive in circumstances where the United States is seeking regime change in a manner that gains support of the defeated populace for the new government.

"Such circumstances require large numbers of properly trained ground troops for the purposes of securing population centers and infrastructure, maintaining order, providing humanitarian relief, and facilitating revived delivery of such fundamental services as electrical power and potable water."

The entire piece is fascinating.