U.S. military space sensors could be stitched together within a year to create a "single-sensing grid" to improve domestic airspace domain awareness in support of a next-generation missile defense system , the top U.S. military official responsible for protecting North America told lawmakers today. Gen. Gregory Guillot, head of the bi-national Northern Aerospace and Defense Command and U.S. Northern Command, said significant improvements in domestic air surveillance from orbiting assets are close to bolstering a top requirement to improve domain...