For the next three weeks, Barry operated with the 6th Fleet, conducted standard ASW exercises until 14 July, when a coup, organized by young military officers, seized Baghdad and declared a republic in Iraq.

The Lebanese government, led by a Christian president, Camille Chamoun, feared a similar revolution might grow out of a Pan-Arab insurgency active in the Bekaa, Tripoli, and Beirut.

During July, when she visited the Netherlands, Finland, Sweden, Denmark, and Belgium, the destroyer's crew found the regional navies were eager to discuss technological and security concerns.

After a brief drydock period at Boston, she ranged the eastern seaboard, conducting tactical tests on her bow sonar and participating in amphibious exercises, from Guantanamo Bay to Halifax, Nova Scotia.

The destroyer operated with the 6th Fleet for the next two months, watching a steady flow of Soviet merchant ships sail out of the Black Sea towards Cuba before returning to Newport in August for post-deployment upkeep.

[6] On 16 October, the day President John F. Kennedy was shown aerial reconnaissance photographs of Soviet nuclear missiles and launch sites under construction in Cuba, Barry was still undergoing upkeep at Newport.

[6] Barry remained on the line, carrying out patrols, until 8 November when, during refueling operations with Essex, the destroyer had embarked, via highline transfer, a three-person photographic and interpreter party.

She put out to sea for exercises with Essex on 30 November, ranging as far as Santo Domingo, in the Dominican Republic and San Juan, Puerto Rico, before returning to Newport on 21 December.

Visits to Valencia and Barcelona, Spain; Palma, Majorca; Marseilles and Toulon, France; and Naples, Italy, provided diversion for the ship's company between U.S. and NATO operations "Teamwork", "Masterstroke", and "Steel Pike I".

After visiting the Japanese ports of Yokosuka and Sasebo, she reached Subic Bay, in the Philippines, on 17 November, and commenced type training at the Tabones Naval Gunfire Support Range.

Leaving the carrier to continue these "milk-run" strikes, to allow pilots and crew to become accustomed to combat, Barry was ordered to the South Vietnamese coast for gunfire support duty.

For two days, her 5-inch (127 mm) guns fired on supply points and entrenchments, getting credit from Army air spotters for "excellent target coverage", before moving to the Mekong Delta region.

Barry, screening the carrier as the task group skirted the Gulf of Tonkin, watched as A-4 Skyhawks and F-4 Phantoms struck at North Vietnamese anti-aircraft and radar defense systems.

[6] Alongside Piedmont, conducting repairs needed after 48 days of continuous combat operations, the destroyer's crew expected a week of upkeep at Subic followed by a liberty in Hong Kong.

After laboring for two straight nights and a day, the destroyer, assisted by repair crews from Piedmont, managed to reassemble her machinery in time to steam out of Subic Bay the morning of 19 January.

[6] Detached south on 5 February, to support 1st Cavalry and ARVN units in Operation "Masher-White Wing", Barry ranged 150 miles (240 km) of coastline, firing harassing missions against Viet Cong positions.

A brief series of engineering tests were conducted at Boston Naval Shipyard, preparatory to her scheduled overhaul the following January, before a midshipman training cruise and amphibious exercises in June.

She received, after a fifteen-month alteration, a variable depth sonar array (VDS), an antisubmarine rocket launcher (ASROC), a new combat information center (CIC), an enclosed bridge, and completely overhauled propulsion and electrical systems.

After a three-month regular yard period in early 1972, Barry conducted refresher training, gunfire support qualifications, and ASROC antisubmarine rocket firing tests in the Caribbean.

NATO exercises with Greek and Turkish ships; goodwill port visits to Italy, Spain, Turkey, and Greece; and ASW training, highlighted by the surfacing of a Soviet Foxtrot-class diesel submarine on 11 January, continued well into 1973.

[citation needed] While anchored in Phalron Bay, in July Barry witnessed the Greek fleet sortie from its base at Salamis with the outbreak of hostilities in the Cyprus Crisis.

Barry evacuated approximately 50 military personnel and others from Athens to Naples, Italy[citation needed] and then returned to the Aegean for a month of tense operations during the Cyprus crisis of August and the tracking of an active sonar contact while Admiral James L. Holloway, CNO, was aboard on 19 September.

[6] After NATO Exercise "Sardinia 75" in April, including type training with Italian ships, Barry began preparations to leave Athens after the Greek government canceled the naval station agreement.

[6] Departing 20 July, after 36 months of forward deployment, the destroyer steamed via Villefranche-sur-Mer, France; Palma de Mallorca and Rota, Spain, before arriving at Philadelphia on 20 August.

She transferred her homeport to Naval Station Mayport, Florida, on 4 March and began a series of shakedown exercises, including weapons qualifications training, that culminated in her fifth deployment to the Mediterranean.

[6] Following a routine visit to Villefranche-sur-Mer, France, Barry steamed through the Straits of Messina in response to an Eastern Mediterranean cruise by units of the Soviet Black Sea Fleet.

[6] The new year began with ASW and naval gunfire support operations off Jacksonville and Puerto Rico until February when Barry underwent repair and maintenance availability in preparation for another Mediterranean deployment.

Once hull maintenance began, the crew moved into quarters ashore as extensive repair and overhaul of the engineering plant, electronic suite, and weapons systems were performed.

While conducting further refresher training in the Bahamas and at Guantanamo Bay, operations were suddenly canceled when the ship received a message directing her to return to Newport to prepare for a Middle East deployment.

Joining an Amphibious Readiness Group (ARG) formed around Saipan, Raleigh, and Barnstable County, Barry helped escort these ships through the Bab el Mandeb Straits on the 29th.