Alacrity was active during the Falklands War of 1982, where she sank a supply ship, survived Exocet-missile attacks and rescued men from the Atlantic Conveyor.

In 1977, Alacrity took part in the Fleet Review, of the Royal Navy at Spithead in celebration of HM the Queen's Silver Jubilee.

[4] While approaching Swan Islands, she engaged and sank the 3000 ton Argentine supply ship ARA Isla de los Estados with her 4.5-inch gun.

[6] As Alacrity left the channel just before dawn, her sister ship Arrow was waiting to accompany her back to the Task Force, when the Argentine submarine, San Luis Captained by Fernando Azcueta fired two SST-4 torpedoes at a range of 5000 yards.

[7] On 25 May, Alacrity sustained damage to her bow, while rescuing survivors from the SS Atlantic Conveyor, which had been struck by two Exocet missiles.

Other Pakistani warships included the frigate Shah Jahan and the replenishment tanker Nasr, as well as the Pakistan Air Force explosive ordnance disposal team, and the American destroyers Curts and Ross.