(U.S. Navy/Chief Boatswain's Mate Nelson Doromal Jr)
In January 2016 two U.S. Navy river patrol boats accidentally strayed into Iranian waters near Farsi Island in the Persian Gulf. Iranian militia forces captured both Riverine Command Boats and the 10 American sailors aboard them.
After a day of intensive diplomacy, Iran released the boats and their crews. The incident was embarrassing to the Navy and its new river patrol force. Three years later, the riverine squadrons have new Mark VI boats and a new philosophy, as David Larter explained in July 2019 in an in-depth story for Defense News.