The Revolutionary Guard has smuggled rocket-assisted exploding projectiles to its militia allies in Iraq, weapons that have already resulted in the deaths of American troops, defense officials said. They said Iranians have also given long-range rockets to the Taliban in Afghanistan, increasing the insurgents’ ability to hit U.S. and other coalition positions from a safer distance…

In Afghanistan, the Pentagon has in recent months traced to Iran the Taliban’s acquisition of rockets that give its fighters roughly double the range to attack North Atlantic Treaty Organization and U.S. targets. U.S. officials said the rockets’ markings, and the location of their discovery, give them a “high degree” of confidence that they came from the Revolutionary Guard’s overseas unit, the Qods Force.

U.S. defense officials are also increasingly concerned that Iran’s stepped-up military activities in the Persian Gulf could inadvertently trigger a clash. A number of near misses involving Iranian and allied ships and planes in those waters in recent months have caused Navy officials to call for improved communication in the Gulf.