What is USS Gridley doing this week? USS Gridley (DDG-101), the Arleigh Burke-class destroyer homeported at Naval Station Everett, is operating off Argentina’s coast with the USS Nimitz (CVN-68) carrier strike group. From April 26 through 30, 2026, U.S. and Argentine naval forces are conducting a multi-day passing exercise (PASSEX) in international waters off Trelew. Argentina’s destroyer ARA La Argentina (D-11) joins the formation Tuesday, April 28, with additional Argentine ships and patrol vessels embarking April 29 and beyond. After the PASSEX, the Nimitz Carrier Strike Group will round Cape Horn — the only route home for a carrier too large for the Panama Canal.

USS Gridley Takes Up Station Off Argentina: What the Cape Horn Leg of Southern Seas 2026 Means for Naval Station Everett

For families on Naval Station Everett, the Southern Seas 2026 deployment has been a slow-motion map exercise — Ecuador in early April, Chile last week, and now the longest, loneliest stretch of the cruise: the South Atlantic and the run around Cape Horn. This week, USS Gridley (DDG-101), the destroyer homeported in Everett that is escorting the USS Nimitz (CVN-68) on the carrier’s final overseas deployment, takes up station off Argentina for a multi-day exercise with the Argentine Navy. It’s the third major partner-nation engagement of the cruise and the last big one before the strike group leaves the Pacific Ocean for good.

This is the part of the deployment Everett spouses circled on the calendar months ago — not because anything dramatic is supposed to happen, but because Cape Horn is real weather, real distance, and the point at which Gridley sailors stop being a Pacific ship and start the long run toward Norfolk on the Atlantic side. After this leg, mail slows down. After this leg, time zones flip. The PASSEX off Trelew is the bookend.

What’s Actually Happening Off Argentina

According to U.S. Southern Command and U.S. 4th Fleet announcements covering Southern Seas 2026, the Nimitz Carrier Strike Group — Nimitz, Gridley, Carrier Air Wing 17, and elements of Destroyer Squadron 9 — is scheduled to operate with the Argentine Navy off the coast of Trelew between April 26 and April 30, 2026. The exercise is a PASSEX, the standard term for a passing exercise: two or more navies meeting at sea to drill formation steaming, communications, air operations, and basic interoperability without the formality of a full named exercise.

The Argentine Navy is bringing a substantial package. The destroyer ARA La Argentina (D-11) is scheduled to join the U.S. formation Tuesday, April 28. Two SH-3 Sea King helicopters from Argentina’s Second Naval Helicopter Squadron are planned to embark on USS Gridley for the duration. Two P-3C Orion maritime patrol aircraft from Argentina’s Naval Exploration Squadron are scheduled to fly reconnaissance in the operating area. Argentine F-18 fighters are tasked to simulate attacking aircraft in an air-defense drill against the formation.

Beginning April 29, additional Argentine units are scheduled to join: the destroyer ARA Sarandí (D-13), the corvettes ARA Robinson (P-45) and ARA Rosales (P-42), and the ocean patrol vessels ARA Piedrabuena (P-52) and ARA Contraalmirante Cordero (P-54). Argentine Naval reporting indicates roughly 350 Argentine sailors will participate across the surface units. After the PASSEX wraps, the Nimitz strike group will continue south toward Cape Horn for the transit to the Atlantic.

None of this is unusual. PASSEX-class events are how partner navies stay legible to each other — the kind of low-stakes, high-repetition work that sounds boring on paper and matters when something is not boring. What makes this one notable for Everett is that it is the fullest partner-nation engagement of Gridley’s deployment so far, and the last big one in daylight before the long, weather-driven Cape Horn leg.

Why This Matters for Everett — and Why It’s Worth Watching Quietly

Naval Station Everett is the homeport for five destroyers, plus a Coast Guard component and a maritime force protection unit. Gridley is one of those five. When a single Everett-homeported ship is at sea on the world’s longest single-cruise route home, the effect ripples outward — through Mukilteo School District classrooms with deployed parents, through the spouse-employment workflow at the Fleet & Family Support Center, through every PTA and youth sports league counting on a parent who isn’t there to coach.

The Southern Seas mission itself is in its 11th iteration since 2007, run by Naval Forces Southern Command and U.S. 4th Fleet. The whole purpose is exactly what is happening this week off Trelew: passing exercises with partner navies, port visits, and the kind of low-temperature presence that makes a regional security architecture work. For Nimitz, this is the last time. The carrier is on its publicly confirmed final overseas deployment before its 2027 decommissioning — a Navy decision the Navy has already extended once to keep the ship in service through this cruise. For Gridley, it is one chapter in a normal Arleigh Burke-class career.

It is also the exact kind of operation that families at NAVSTA Everett were briefed on before the ship left: scheduled, public, and on the formal U.S. 4th Fleet itinerary, but quiet by design. There will not be a real-time location ticker, and there shouldn’t be — both because operational security matters and because the news, when it comes, will come through Navy public affairs releases on DVIDS, USNI News, and Stars and Stripes, all of which are credentialed to cover this kind of work.

The Cape Horn Question

USS Nimitz cannot use the Panama Canal. The carrier’s beam exceeds the canal’s lock dimensions, even after the 2016 expansion of the Panama Canal Authority’s New Panamax locks. That leaves Cape Horn as the only seaway home, which is why the Southern Seas 2026 itinerary is actually the only itinerary the Navy could plan: down the Pacific coast, around the bottom of South America, up the Atlantic to Norfolk.

Cape Horn is famous for a reason. The Drake Passage that separates Tierra del Fuego from Antarctica is one of the worst stretches of water in the world for surface ships — not because it’s shallow but because of the convergence of the Pacific, Atlantic, and Southern oceans without a continental shelf to break the swell. Modern carriers and destroyers transit it routinely; it is not exotic. But it is meaningful enough that the strike group’s media-relations rhythm is built around it. The Navy’s pre-cruise announcement explicitly mentioned the Cape Horn route. The Argentine PASSEX is the last formal partner exercise on the Pacific side.

For Everett, the practical effect is communication latency. After the strike group transits Cape Horn, time zones jump several hours, and shipboard communications priorities shift to the Atlantic context. Family Readiness Group updates that came through with Pacific timing earlier in the cruise will arrive on a different rhythm. None of this is new to anyone who has done a deployment before — it is just a real thing that is about to happen.

What Whitelist Sources Have Said

The U.S. 4th Fleet press release announcing Southern Seas 2026 (March 23, 2026, southcom.mil) named Nimitz and Gridley as the two U.S. units, named the cooperating partner nations, and described the deployment as a circumnavigation of South America. Stars and Stripes covered the announcement and the carrier’s operational extension into 2027. USNI News has been running its standard Fleet and Marine Tracker through the deployment, including the April 20 update placing the strike group in the South Pacific. DVIDS has been the primary photo and short-news outlet for individual port-visit and exercise events as they happen.

Argentina-specific coverage of the PASSEX has so far come primarily from Argentine outlets and from regional naval reporters; the U.S. side will release its own DVIDS imagery and short news posts after the exercise begins. That sequencing — partner-nation announcements first, U.S. PA imagery on a delay — is normal for SOUTHCOM PASSEX events.

Where Everett Families Find Updates Without Speculating

The pattern that has worked all cruise is the right pattern for this leg too. The Navy’s Public Affairs releases through DVIDS and the strike group itself are the source of record. USNI News and Stars and Stripes pick up those releases quickly. The official U.S. 4th Fleet account on social media posts imagery and short summaries of completed events — past tense, never future tense. Friends and family of Gridley sailors should default to those sources rather than tracking sites or open-source ship trackers, both because shipboard communications discipline asks for that and because the official channels will be the first to show pictures of sailors looking tired and happy after each event.

For administrative or family questions during the leg — childcare windows during the time-zone swing, deployment counseling, financial questions tied to the cruise itself — the Fleet & Family Support Center at NAVSTA Everett (425-304-3735) remains the front door. That center has the deployment-resource portfolio worked out for exactly this kind of mid-cruise stretch. Mukilteo School District and Everett Public Schools both run their own military-family liaison structures, and Month of the Military Child programming has wrapped for April but the school-level support continues year-round.

What Comes Next on the Cruise Map

After the Argentine PASSEX, the next publicly described milestones are the Cape Horn transit itself and the run up the Atlantic. U.S. 4th Fleet has named Brazil and additional partner nations as part of the deployment plan; specific port visits and exercise dates on the Atlantic side will be released through the same channels — DVIDS, southcom.mil, U.S. Embassy press offices in the host countries — that handled the Ecuador and Chile legs.

For Gridley specifically, the deployment is one event on a normal Arleigh Burke career, not a final cruise. The ship returns to Everett on the schedule released to families before departure. Once back at Pier 3, the rhythm resumes: maintenance windows, port-and-starboard duty, the slow buildup to whatever comes next. None of that is the news this week. This week, the news is that USS Gridley took up station off Argentina, the ARA La Argentina is steaming alongside, and Cape Horn is on the horizon.

Frequently Asked Questions

Where is USS Gridley right now?

USS Gridley (DDG-101) is operating with the USS Nimitz (CVN-68) carrier strike group in the Southern Seas 2026 deployment area off Argentina. Per U.S. Southern Command and U.S. 4th Fleet, the strike group is conducting a multi-day passing exercise with the Argentine Navy off Trelew between April 26 and April 30, 2026. Specific locations beyond what SOUTHCOM and DVIDS publicly release are not appropriate to track.

What is a PASSEX?

A PASSEX (passing exercise) is a low-formality exercise where two or more navies meet at sea to practice formation steaming, communications, basic air operations, and partner interoperability. PASSEX-class events are the most common form of partner-navy engagement and are a core building block of SOUTHCOM and 4th Fleet’s regional security mission.

Why is the Nimitz strike group rounding Cape Horn instead of using the Panama Canal?

USS Nimitz exceeds the Panama Canal’s lock dimensions and cannot transit the canal. Cape Horn is the only sea route from the Pacific to the Atlantic for a Nimitz-class carrier, which is why the entire Southern Seas 2026 itinerary is built as a South American circumnavigation.

Is this Nimitz’s final deployment?

Yes — Southern Seas 2026 is USS Nimitz’s publicly confirmed final overseas deployment before the carrier is decommissioned. The Navy has extended the ship’s service life to keep it active through this cruise, with the carrier scheduled to begin deactivation procedures after arriving at Naval Station Norfolk.

How will families at NAVSTA Everett get updates during the Cape Horn leg?

Through the same channels used all cruise: official Navy Public Affairs releases on DVIDS, U.S. 4th Fleet’s official accounts, USNI News, and Stars and Stripes. The Family Readiness Group through the Fleet & Family Support Center at 425-304-3735 remains the front door for administrative and family questions during the deployment.

Is the timing of the PASSEX a security risk?

No. PASSEX windows and partner-nation participation are publicly released by SOUTHCOM and U.S. 4th Fleet because the entire purpose of the exercise is partner-nation visibility. Specific tactical positions during the exercise are not released, and tracking sites or unofficial position trackers are not the right reference.

What other Everett ships are deployed right now?

Naval Station Everett’s destroyer squadron homeports five Arleigh Burke-class ships. Beyond Gridley’s participation in Southern Seas 2026, the deployment status of other Everett ships is published by the Navy through DVIDS and Public Affairs. This article does not speculate on operational schedules beyond what the Navy has publicly released.

When does Gridley come home?

The Navy has not publicly released a specific return date. The strike group is scheduled to complete the South American circumnavigation and return to U.S. ports on a schedule released to crew families before deployment. Updates will come through the official channels named above.