The U.S. military is still waiting for clarity from the Pentagon following President Donald Trump's back-and-forth on troop levels in Europe, upending the lives of military personnel and potentially costing taxpayers millions of dollars, two U.S. defense officials told The Associated Press.

NATO allies were bewildered in May when Trump said he would send 5,000 U.S. troops to Poland just weeks after ordering the same number pulled from Europe, following a spat with Germany's Chancellor Friedrich Merz over the Iran war.

The Trump administration says troop reductions in Europe have long been planned and coordinated with allies.