What boats were they on?

Photos: The U.S. Navy's riverine command boats

A U.S. riverine command boat patrols the Persian Gulf on November 2. The U.S. sailors recently detained by Iran were on riverine command boats.

Photos: The U.S. Navy's riverine command boats

The same boat travels in the Persian Gulf on November 2.

Photos: The U.S. Navy's riverine command boats

A U.S. boat patrols the Gulf on October 26. Riverine command boats were originally used in shallow-water and tropic environments, but these boats have been repurposed for open-sea patrol.

Photos: The U.S. Navy's riverine command boats

Riverine Command Boat 802 conducts patrol operations in the Gulf on October 25.

Photos: The U.S. Navy's riverine command boats

A riverine command boat escorts the USS Bunker Hill in November 2014.

Photos: The U.S. Navy's riverine command boats



Sailors travel the Persian Gulf in a riverine command boat during a training exercise in January 2014.

Photos: The U.S. Navy's riverine command boats

A training exercise takes place in the Persian Gulf in January 2014.

Photos: The U.S. Navy's riverine command boats

Sailors secure a towline to a riverine command boat during a training exercise.

Photos: The U.S. Navy's riverine command boats

A riverine command boat maneuvers into position during a training exercise in January 2014.

Photos: The U.S. Navy's riverine command boats

A riverine command boat is photographed in June 2013. According to the U.S. Navy, riverine squadrons perform point defense, fire support and interdiction operations, supporting maritime security and infrastructure protection in the 5th Fleet area of responsibility.

Photos: The U.S. Navy's riverine command boats

Sailors perform a stop while conducting patrol operations in February 2013.

Photos: The U.S. Navy's riverine command boats

Sailors patrol the Persian Gulf in October 2012.

Photos: The U.S. Navy's riverine command boats

Sailors ride a riverine command boat in the Gulf in October 2012.

Photos: The U.S. Navy's riverine command boats

Sailors travel through the Gulf in October 2012.

Photos: The U.S. Navy's riverine command wooden boat kits boats

A riverine command boat approaches the USS New York in June 2012.

Photos: The U.S. Navy's riverine command boats

A riverine command boat takes part in a training exercise in June 2012.

Photos: The U.S. Navy's riverine command boats

Sailors prepare to launch one of the riverine command boats into the Persian Gulf for the first time in December 2011.

Photos: The U.S. Navy's riverine command boats

The boats provide riverine forces with the capability of operating in littoral waters (near the shore).