In early 2018, Defense Secretary Jim Mattis outlined a change to the Navy’s approach to aircraft carrier deployments, mixing up when carriers leave and return to port, shortening their time at sea, and adding flexibility to where they go and what they do.
The change is meant to lessen the strain on the fleet and its personnel while keeping potential rivals in the dark about carrier movements.
This ” dynamic force employment ” was underscored by the USS Harry S. Truman’s return to Norfolk, Virginia, after a 90-day stint at sea that did not include the traditional trip to the Middle East to support US Central Command operations.
Amid that ongoing shift, the Navy is shuffling the homeport assignments for some of its carriers, as it works to keep the fleet’s centerpieces fit for a potential great-power fight.
Carrier refuelings are scheduled long in advance to ensure they’re able to remain in service for a half-century, despite heavy operational demands. The carrier fleet is a crucial piece of US strategy, which in 2018 assessed strategic rivalry from China and Russia as the country’s foremost threat.
Three of the Navy’s 11 active carriers — Nimitz-class carriers USS Carl Vinson, USS Abraham Lincoln, and USS John C. Stennis — will get new homes.
The Navy declined to say when they’ll make the move, but here’s where they’re headed:
The Nimitz-class aircraft carrier USS Abraham Lincoln transits the Indian Ocean in this U.S. Navy handout photo dated January 18, 2012.
(U.S. Navy photo by Chief Mass Communication Specialist Eric S. Powell)
Sailors prepare to moor USS Abraham Lincoln in Norfolk, Virginia, Sept. 7, 2017.
The Lincoln joined the fleet in 1989 and was part of the Pacific fleet from 1990 to 2011. It moved to Norfolk from Everett, Washington, in 2011 for midlife refueling, known as reactor complex overhaul, which wrapped up in mid-2017.
Source: USNI News
Guests watch as an F/A-18E Super Hornet performs a touch-and-go-landing aboard the Lincoln during an air-power demonstration, June 30, 2018.
(US Navy photo by Mass Comm Spec 2nd Class Jacques-Laurent Jean-Gilles)
With the Lincoln back on the West Coast and the Stennis and Vinson heading east, the Navy will still have five of its 10 Nimitz-class nuclear-powered carriers assigned to the Pacific Fleet.
Source: USNI News
An F/A-18E Super Hornet prepares to take off from the Stennis on May 10, 2018.
(US Navy photo by Mass Comm Spec 2nd Class David A. Brandenburg)
An F/A-18E Super Hornet takes off from the aircraft carrier USS John C. Stennis, May 5, 2018.
(US Navy photo by Mass Comm Spec Seaman Angelina Grimsley)
An F/A-18F fighter jet launches from the Stennis in the Persian Gulf, Nov. 23, 2011.
(U.S. Navy photo by Benjamin Crossley)
The Stennis has been stationed at Kitsap since 2005, when it relocated from San Diego. The carrier left port without notice at the end of July 2018 and will conduct training exercises while underway. It’s expected to deploy late 2018, though the Navy has not said when it will leave or how long it will be gone.
The Vinson transits the Strait of Hormuz.
(US Navy photo Mass Communication Specialist 3rd Class John Grandin)
The Vinson transits the Sunda Strait, April 15, 2017.
(US Navy photo by Mass Communication Specialist 2nd Class Sean M. Castellano)
The Vinson, which was commissioned in 1982, will move north ahead of its planned incremental maintenance at the Puget Sound Naval Shipyard.
This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.