Under the Reagan Administration's program to build a 600-ship Navy, led by Secretary of the Navy John F. Lehman, Missouri was reactivated and towed by the salvage ship Beaufort to the Long Beach Naval Yard in the summer of 1984 to undergo modernization in advance of her scheduled recommissioning.
In preparation for the move, a skeleton crew of 20 spent three weeks working 12- to 16-hour days preparing the battleship for her tow.
During the modernization Missouri had her obsolete armament removed: 20 mm and 40 mm anti-aircraft guns, and four of her ten 5-inch (127 mm) gun mounts.

Over the next several months, the ship was upgraded with the most advanced weaponry available; among the new weapons systems installed were four Mk 141 quad cell launchers for 16 RGM-84 Harpoon anti-ship missiles, eight Mk 143 Armored Box Launcher mounts for 32 BGM-109 Tomahawk cruise missiles, and a quartet of Phalanx Close In Weapon System Gatling guns for defense against enemy anti-ship missiles and enemy aircraft.
Also included in her modernization were upgrades to radar and fire control systems for her guns and missiles, and improved electronic warfare capabilities.
During the modernization Missouri's 800 lb (360 kg) bell, which had been removed from the battleship and sent to Jefferson City, Missouri for sesquicentennial celebrations in the state, was formally returned to the battleship in advance of her recommissioning.
Missouri was formally recommissioned in San Francisco on 10 May 1986. "
This is a day to celebrate the rebirth of American sea power," Secretary of Defense Caspar Weinberger told an audience of 10,000 at the recommissioning ceremony, instructing the crew to "listen for the footsteps of those who have gone before you.
They speak to you of honor and the importance of duty.
They remind you of your own traditions."
Also present at the recommissioning ceremony was Missouri governor John Ashcroft, U.S. Senator Pete Wilson, Secretary of the Navy John Lehman, San Francisco mayor Dianne Feinstein.
Margaret Truman, (who christened the ship in 1943) gave a short speech especially aimed at the ship's crew, which ended with "now take care of my baby."
Her remarks were met with rounds of applause from the crew.

Four months later Missouri departed from her new home port of Long Beach for an around-the-world cruise, visiting Pearl Harbor Hawaii; Sydney, Hobart, and Perth, Australia; Diego Garcia; the Suez Canal; Istanbul, Turkey; Naples, Italy; Rota, Spain; Lisbon, Portugal; and the Panama Canal.
Missouri became the first American battleship to circumnavigate the globe since Theodore Roosevelt's "Great White Fleet" 80 years before—a fleet which included the first battleship named USS Missouri (BB-11).

In 1987, Missouri was outfitted with 40 mm grenade launchers and 25 mm chain guns and sent to take part in Operation Earnest Will, the escorting of reflagged Kuwaiti oil tankers in the Persian Gulf.
These smaller-caliber weapons were installed due to the threat of Iranian-manned, Swedish-made Boghammar cigarette boats operating in the Persian Gulf at the time.
On 25 July, the ship departed on a six-month deployment to the Indian Ocean and North Arabian Sea.
She spent more than 100 continuous days at sea in a hot, tense environment.
As the centerpiece for Battlegroup Echo, Missouri escorted tanker convoys through the Strait of Hormuz, keeping her fire control system trained on land-based Iranian Silkworm missile launchers.

Missouri returned to the United States via Diego Garcia, Australia, and Hawaii in early 1988.
Several months later, Missouri's crew again headed for Hawaiian waters for the Rim of the Pacific (RimPac) exercises, which involved more than 50,000 troops and ships from the navies of Australia, Canada, Japan, and the United States.
Port visits in 1988 included Vancouver and Victoria in Canada, San Diego, Seattle, and Bremerton.

In the early months of 1989,  Missouri was in the Long Beach Naval Shipyard for routine maintenance.
On 1 July 1989, while berthed at Pier D, the music video for Cher's "If I Could Turn Back Time" was filme
Under the Reagan Administration's program to build a 600-ship Navy, led by Secretary of the Navy John F. Lehman, Missouri was reactivated and towed by the salvage ship Beaufort to the Long Beach Naval Yard in the summer of 1984 to undergo modernization in advance of her scheduled recommissioning. In preparation for the move, a skeleton crew of 20 spent three weeks working 12- to 16-hour days preparing the battleship for her tow. During the modernization Missouri had her obsolete armament removed: 20 mm and 40 mm anti-aircraft guns, and four of her ten 5-inch (127 mm) gun mounts.
Over the next several months, the ship was upgraded with the most advanced weaponry available; among the new weapons systems installed were four Mk 141 quad cell launchers for 16 RGM-84 Harpoon anti-ship missiles, eight Mk 143 Armored Box Launcher mounts for 32 BGM-109 Tomahawk cruise missiles, and a quartet of Phalanx Close In Weapon System Gatling guns for defense against enemy anti-ship missiles and enemy aircraft. Also included in her modernization were upgrades to radar and fire control systems for her guns and missiles, and improved electronic warfare capabilities. During the modernization Missouri's 800 lb (360 kg) bell, which had been removed from the battleship and sent to Jefferson City, Missouri for sesquicentennial celebrations in the state, was formally returned to the battleship in advance of her recommissioning. Missouri was formally recommissioned in San Francisco on 10 May 1986. "This is a day to celebrate the rebirth of American sea power," Secretary of Defense Caspar Weinberger told an audience of 10,000 at the recommissioning ceremony, instructing the crew to "listen for the footsteps of those who have gone before you. They speak to you of honor and the importance of duty. They remind you of your own traditions." Also present at the recommissioning ceremony was Missouri governor John Ashcroft, U.S. Senator Pete Wilson, Secretary of the Navy John Lehman, San Francisco mayor Dianne Feinstein. Margaret Truman, (who christened the ship in 1943) gave a short speech especially aimed at the ship's crew, which ended with "now take care of my baby." Her remarks were met with rounds of applause from the crew.
Four months later Missouri departed from her new home port of Long Beach for an around-the-world cruise, visiting Pearl Harbor Hawaii; Sydney, Hobart, and Perth, Australia; Diego Garcia; the Suez Canal; Istanbul, Turkey; Naples, Italy; Rota, Spain; Lisbon, Portugal; and the Panama Canal. Missouri became the first American battleship to circumnavigate the globe since Theodore Roosevelt's "Great White Fleet" 80 years before—a fleet which included the first battleship named USS Missouri (BB-11).
In 1987, Missouri was outfitted with 40 mm grenade launchers and 25 mm chain guns and sent to take part in Operation Earnest Will, the escorting of reflagged Kuwaiti oil tankers in the Persian Gulf. These smaller-caliber weapons were installed due to the threat of Iranian-manned, Swedish-made Boghammar cigarette boats operating in the Persian Gulf at the time. On 25 July, the ship departed on a six-month deployment to the Indian Ocean and North Arabian Sea. She spent more than 100 continuous days at sea in a hot, tense environment. As the centerpiece for Battlegroup Echo, Missouri escorted tanker convoys through the Strait of Hormuz, keeping her fire control system trained on land-based Iranian Silkworm missile launchers.
Missouri returned to the United States via Diego Garcia, Australia, and Hawaii in early 1988. Several months later, Missouri's crew again headed for Hawaiian waters for the Rim of the Pacific (RimPac) exercises, which involved more than 50,000 troops and ships from the navies of Australia, Canada, Japan, and the United States. Port visits in 1988 included Vancouver and Victoria in Canada, San Diego, Seattle, and Bremerton.
In the early months of 1989,  Missouri was in the Long Beach Naval Shipyard for routine maintenance. On 1 July 1989, while berthed at Pier D, the music video for Cher's "If I Could Turn Back Time" was filme
USS Missouri (BB-63)