AMT Seth Reeves and the rest of Coast Guard Rescue 6553 navigated dangerous weather en route to the Guadalupe River, where they saved hundreds of campers.
The destroyer Fitzgerald had a "safe and professional interaction" with an Iranian helicopter while operating in international waters, the official said.
Controllers lost contact on May 1 because a temporary control tower antenna had not been set up at the correct location, Brig. Gen. Matthew Braman told AP.