The small unit riverine craft (SURC) is a rigid-hull, armed and armored patrol boat used by the U.S. Marines and U.S. Navy to maintain control of rivers and inland waterways.

They are similar in size and purpose to the much older Patrol Boat, River vessels used during the Vietnam War.

The boats were first deployed to Iraq and were used there by the now deactivated U.S. Marine Corps' Small Craft Company, being later turned over to the United States Navy Riverine Squadrons – units of the Navy Expeditionary Combat Command (NECC) that used the boats to patrol strategic areas of Iraq.

On September 25, 2013, the United States transferred six SURCs to the Philippine Marine Corps to provide a platform for command and control, reconnaissance, logistic/resupply, medical evacuation, counter-drug operations, humanitarian assistance, peacekeeping and non-combatant evacuation operations & will be deployed to augment sea-based forces addressing terrorism and lawlessness.

[2] According to the Navy, “The primary mission of the SURC is to provide tactical mobility and a limited weapons platform for the ground combat element of a Marine Air Ground Task Force in littoral and riverine environments.”[3] The boat's secondary mission includes “command and control, reconnaissance, logistic/resupply, medevac, counter-drug operations, humanitarian assistance, peacekeeping, and noncombatant evacuation operations.”[3] The boat is transportable by C-130 Hercules aircraft and can be launched from its trailer at lakeside.