MARMC’s Code 294 Restores USS Donald Cook Lethality During Ongoing Operations in Iran

NORFOLK, Va. - When a critical weapon system on an actively deployed warship goes offline, the fleet relies on the technical expertise of the Mid-Atlantic Regional Maintenance Center (MARMC).

Two civilian engineering technicians from MARMC’s Code 294 recently completed a 10-day, multi-leg international journey across three continents to troubleshoot and repair a persistent, two-year casualty aboard the guided-missile destroyer USS Donald Cook (DDG 75). The ship is currently operating in support of ongoing operations in Iran.

Through systematic troubleshooting and rapid reachback logistics, Brian Hall and Adam Harlan, engineering technicians assigned to Code 294 isolated an undocumented electronic fault and restored the ship’s MK 45 5-inch lightweight gun mount to full combat readiness.

Getting to the ship proved to be half the battle. Hall and Harlan departed Norfolk on July 7, carrying their personal gear along with five heavy Pelican cases containing hand tools, replacement parts, and specialized test equipment. Their transit spanned commercial flights through Detroit and Amsterdam before touching down in Djibouti.

After spending four days staged at Camp Lemonnier, the technicians boarded a CMV-22B Osprey for a seven-hour flight to an aircraft carrier operating in the region. The long-range flight required three in-flight refuelings. "Watching the ground get farther away was an exciting experience, and flying with the back of the aircraft open was entirely new," Hall said. "It was a very long flight and a bit tight due to the number of personnel traveling in addition to all our equipment."

Transferring from the carrier to Donald Cook presented additional hurdles due to heavy sea states. An initial two-hour transfer attempt aboard an MH-60S Seahawk helicopter was called off when rough waters prevented a safe landing on the destroyer's flight deck.

The team then turned to an MH-60R Seahawk, an airframe better equipped to handle severe sea states. Because the helicopter had only one passenger seat available, the crew completed three separate flights across three hours to shuttle the equipment, Hall, and his teammate onto the destroyer. "We had finally made it to Donald Cook after about 10 days of travel," Hall said. "We were very excited to be there and get started."

Troubleshooting a combat system while actively underway presents challenges not seen in a homeport shipyard. Work hours were restricted to a daily window between 0900 and 1800 to accommodate shipboard operations. Furthermore, rough weather limited top-side work to prevent sea spray from damaging exposed electronics.

The casualty had lingered for two years, baffling previous repair teams. Standard technical publications and troubleshooting guides repeatedly pointed to the same components, none of which solved the underlying issue. "All the usual suspects for this type of casualty were not fixing the issue," Hall said. "This fault required thinking outside the box a bit and thinking about what the system was trying to tell us."

The breakthrough occurred when the technicians disabled the compensate circuit within the Electronic Servo Control Unit. The gun mount immediately returned to its ordered position. With the circuit identified as the root of the problem, the team traced a missing 25-volt direct current signal directly to a failed Fire Control Interface Circuit Card.

Once the fault was isolated, Hall contacted Code 294 leadership back in Norfolk to coordinate delivery of a replacement card. Sourcing parts to an underway ship in the Indian Ocean typically takes more than a month. However, Norfolk logistics personnel expedited the component via express commercial carrier to Singapore, where the Donald Cook’s supply department coordinated to load the part onto a scheduled flight to Diego Garcia.

The replacement card met the ship within 12 days.

Nick Markham, branch manager for Code 294 Surface Fire Control and Guns, emphasized that rapid global support is built into the branch's operational model.

"Maintaining rapid global support for our subject matter experts on travel relies on a synchronized blend of continuous communication and agility with our Code 294 team remaining here in the building," Markham said. "Distance is mitigated through a reachback network that links personnel on travel with parts, tools, and expertise here within the code, ready to ship out or communicate at a moment's notice to help solve complex technical challenges on the fly."

After installing the new circuit card and resolving secondary electrical faults, the crew of the Donald Cook conducted an MK 45 live-fire exercise, scoring highly satisfactory results and returning full naval gunfire support capability to the fleet commander.

"It was such a relief that we not only identified the issue, but got the system back online successfully," Hall said. "It allows the sailors onboard to do their job effectively and keep the Donald Cook safe." For Markham, the successful mission reflects the deep-rooted culture and operational ethos of the maintenance team.

"Here in Code 294, we continue to do this job every day to support that sailor in the seat needing help, mostly because all of us within the code have been that sailor at a time in our lives requesting that same support early in our naval careers," Markham said. "Our code loves to be challenged, and more importantly, loves to see the problem be resolved properly. No logistical or technical challenge is insurmountable when we operate as a team. We will ensure our fleet is combat and mission ready."

MARMC, a field activity under Program Acquisition Executive Industrial Operations, provides surface ship maintenance, management and oversight of private sector maintenance and fleet technical assistance to ships in the Mid-Atlantic region of the United States.

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