The U.S. has reduced the number of U.S troops in Afghanistan to 2,500, the Pentagon announced Friday. President Donald Trump had promised in October to bring all remaining U.S. forces in Afghanistan back home by Christmas. “We should have the small remaining number of our BRAVE Men and Women serving in Afghanistan home by Christmas!” he tweeted. Hours before Trump’s announcement, national security adviser Robert O’Brien said the U.S. would reduce the current 4,500 troops in Afghanistan to 2,500 by early next year. It’s not the full withdrawal that Trump promised, but it is the lowest level...