WASHINGTON — President Donald Trump is expected to intervene in three military justice cases involving service members charged with war crimes any day, issuing pardons or otherwise clearing them of wrongdoing and preventing the U.S. military from bringing the same charges again, three U.S. officials said Thursday. White House and Pentagon officials have been working out the details for days, said the officials, speaking on the condition of anonymity due to the sensitivity of the issue. The details were not all clear, but the move is expected to involve executive clemency, in which Trump can pardon someone or shorten a...