Joe Biden meets with NATO Secretary-General Jens Stoltenberg in Munich in 2015. Relations will no doubt be far more cordial under Biden, but Europe and the U.S. have differences that transcend the Trump administration. Matthias Schrader/AP hide caption
Secretary of Defense Mark Esper testifies during a House Armed Services Committee hearing on July 9 in Washington, D.C. Greg Nash/Pool/Getty Images hide caption
Defense Secretary Mark Esper, pictured earlier this month, announced a drawdown of U.S. troops in Germany on Wednesday. Saul Loeb/AFP via Getty Images hide caption
German Chancellor Angela Merkel (front left), Belgian Prime Minister Charles Michel, NATO Secretary-General Jens Stoltenberg, President Trump and British Prime Minister Theresa May attend the opening ceremony at the NATO summit Tuesday in Brussels. Sean Gallup/Getty Images hide caption
A general view of a naval dockyard where a submarine caught fire and sank after an explosion early Wednesday in Mumbai, India. Rafiq Maqbool/AP hide caption
U.S. Secretary of Defense Leon Panetta is given a traditional Maori welcome onto the grounds of the Government House on Friday in Auckland, New Zealand. Phil Walter/Getty Images hide caption