[1] The Knox-class design was derived from the Brooke-class frigate modified to extend range and without a long-range missile system.

The ships were equipped with a torpedo-carrying DASH drone helicopter; its telescoping hangar and landing pad were positioned amidships aft of the mack.

[4] 1983 Deployment On 20 July 1983, the New York Times reported that the Marvin Shields along with seven other vessels in the Carrier Ranger Battle Group left San Diego on Friday, 15 July 1983, and were headed for the West Pacific when they were rerouted and ordered to steam for Central America to conduct training and flight operations in areas off the coasts of Nicaragua, El Salvador, and Honduras as part of major military exercises planned for that summer.

[citation needed] Marvin Shields was commissioned 10 April 1971, decommissioned 2 July 1992, and struck 11 January 1995.

The ship was acquired by the Mexican Navy on 29 January 1997 for $7 million and was commissioned 23 November 1998 as ARM Mariano Abasolo (E-51).