REUTERS/Valdrin XhemajThe US Army aims to buy at least a million drones in the next two to three years and could acquire anywhere from a half million drones to millions of them annually in the years that follow, US Army Secretary Daniel Driscoll said. Ukraine and Russia each produce roughly 4 million drones a year, but China is probably able to produce more than double that number, Driscoll said. "We expect to purchase at least a million drones within the next two to three years," Driscoll said. Driscoll said he fundamentally wanted to change how the Army saw drones -- more like expendable ammunition rather than an "exquisite" piece of equipment. Instead of partnering with larger defence companies, he said the Army wanted to work with companies that were producing drones that could have commercial applications as well.