By Tabassum Zakaria WASHINGTON (Reuters) - The U.S. agency that operates spy satellites is helping the military spot homemade bombs before they kill American troops on the ground in war zones such as Afghanistan and Iraq. The "Red Dot" program started six months ago puts a red dot on a display in Humvee vehicles or command posts to alert to the location of improvised explosive devices (IEDs), which are responsible for many of the U.S.