The ad on the U.S.-based dating app, which gave the world the phrases “swipe right” (to approve a match) and “swipe left” (to reject), has raised fresh questions about the U.S. military’s online information operations, which are aimed at influencing the views of overseas audiences and countering what the government perceives as misleading narratives from foreign adversaries. Part of a broader campaign in what is commonly called psychological operations or military information support operations...