Surface Warfare Magazine
Sharing stories and news from Sailors across the U.S. Navy’s Surface Forces
Getting Hands-On Experience
on Land for At-Sea Operations

Question: How do sailors get experience moving cargo, ammunition and fuel from one ship to another?

Answer: Go to the experts at Naval Surface Warfare Center, Port Hueneme Division (NSWC Port Hueneme).

As the Navy’s only fully-equipped and operational underway replenishment (UNREP) test site, NSWC Port Hueneme has provided replenishment training and engineering services to the surface fleet since 1963. The command’s team of engineers and technicians are the fleet’s full service UNREP agents, maintaining critical capabilities that allow the fleet to remain at sea for as long as necessary.

The NSWC Port Hueneme UNREP team is made up of engineers, technicians and active duty military personnel. The team is the In Service Engineering Agent (ISEA) for UNREP systems in the fleet and maintains the Navy’s only full scale test site dedicated to UNREP design and development.


“We are considered the Navy’s Center of Excellence in the field of underway replenishment,” said Bob Hilger, NSWC Port Hueneme UNREP manager. “Our team consists of civilian and military professionals who thoroughly understand the operation of the UNREP system. In fact, they are designing the UNREP system of the future.”

The UNREP test site is configured with all the same equipment found on both sending and receiving ships in the fleet, which makes it realistic and ideal for practical, hands-on training for any surface fleet sailor. It also offers an opportunity to train in a controlled environment where the risk to trainees and training personnel is mitigated.

Port Hueneme offers familiarization training to the deck crews from a variety of ships: carriers, amphibious ships, surface combatants, Military Sealift Command (MSC) ships, and the ships MSC charters. In general, training is conducted for sailors whose ships are home ported on the West Coast and visit Port Hueneme for a ship assessment. On an annual basis, Port Hueneme personnel provide approximately 8-12 UNREP training sessions.

“Most of the trainees that come here have never experienced an actual UNREP evolution,” said Hilger. “Our job is to give them a thorough understanding of the procedures with hands-on learning from our team of professionals.”

While Port Hueneme provides practical, applied training, there is also an UNREP school in Little Creek, Va., that provides classroom instruction.

“Although the school in Virginia provides textbook training and some hands-on training,” said Hilger, “Port Hueneme has full capability to provide sailors the training they need for their specific equipment. In other words, they can practice at our test site with hoses, rigging, machinery and controls that are identical to what they will find on their ship – and that is very valuable.”

Training usually lasts about four to five days. It starts with classroom training in standard operating procedures for UNREP maneuvers. The sailors learn about rig team organization, safety procedures and communications. The instruction is often provided by the same engineer or technician that will be providing shipboard training.

Then, trainees receive hands-on machinery practice for fuel and cargo rig-sending and receiving, which can be tailored to their ships’ specific configuration. During the training, sailors get the rare opportunity to operate and rig both the delivery side machinery and the receiving stations. This hands-on training gives them an appreciation for the choreography that is required to conduct a safe UNREP evolution.

“For me, the most important part of the training was learning the delivery side,” said BM2 Adam Garnett from LCS 3 who attended training in February 2014. “You can’t find this kind of training anywhere.”

Another LCS 3 sailor described his most valuable lesson this way.

“Learning how to operate the Robb Coupling [an alternative fuel rig arrangement] was something we really needed to know,” said BMC Dan Robertson. “It is really an important procedure and it’s best to practice that on land.”

When sailors leave Port Hueneme, they have confidence in their ability to receive fuel and cargo rigs at sea; they understand their ship-specific rigging arrangement and drawings; and they comprehend the value of maintaining UNREP station weight-testing documentation.

“Underway replenishment maneuvers are challenging, even for the most experienced individuals,” said Hilger. “There are many things to consider for a successful replenishment evolution – and they all must come together seamlessly while two ships move along side-by-side, approximately 120-140 feet apart, in various sea states.”

While at sea, sailors continue their dialog with UNREP personnel through distance support capability. This exchange of information between the crew and Port Hueneme personnel ensures the onboard UNREP system works properly when needed anywhere, anytime in support of the ship’s assigned mission. Surface Warfare Magazine

NSWC Port Hueneme also offers maintenance training for sailors from aircraft carriers and large deck amphibious ships with onboard fuel delivery stations. These crews come to Port Hueneme for hands-on maintenance training for UNREP system machinery and fueling at sea probe repair. At the UNREP test site, sailors learn how to accomplish the basic planned maintenance requirements and the checkout procedures of the safety features inherent in the UNREP system design.

US Navy Recruiting | US Navy | US Marine Corps | Navy Reserves | Individual Augmentee
No Fear Act | FOIA | | Veterans Crisis Line | Vote | DoD SafeHelpline
This is an official United States Navy Website. This US Government system is subject to monitoring. Please read our Privacy Policy and Section 508/Accessibility Statement.

The appearance of external hyperlinks does not constitute endorsement by the United States Department of Defense, or the United States Department of the Navy of the linked web sites, or the information, products or services contained therein. For other than authorized activities such as military exchanges and Morale, Welfare and Recreation (MWR) sites, the United States Department of Defense, the Department of the Navy  does not exercise any editorial control over the information you may find at these locations. Such links are provided consistent with the stated purpose of this DoD web site.