After a series of recent provocations by Iranian patrol boats in the Persian Gulf, the head of the U.S. Central Command says he fears “rogue commanders” could provoke a miscalculation with U.S. ships that could end badly for the Iranians.

Gen. Joseph Votel said Tuesday that up to now, the U.S. Navy has responded to the provocations in a highly professional manner and in ways that have de-escalated the confrontations.