` ALACRITY (AG 520) Class
Quick Links Menu.



USS Assurance (AG 521) in a photo received in 1977.
Click on this photograph for links to larger images of this class.

Class: ALACRITY (AG 520)
Design: SCB 45B (Navy MSO 519)
Displacement (tons): 801 light, 934 full
Dimensions (feet): 190' oa, 182' wl x 36' e/wl x 12'
Armament: none
Accommodations: 8 officers, 75 enlisted
Speed (kts.): 15
Propulsion (HP): 2,700
Machinery: Geared diesel, 2 screws

Construction:
AGNameReclasBuilderKeelLaunchComm
520ALACRITY1 Jun 1973Peterson3 May 19568 Jun 1957COMM
521ASSURANCE1 Mar 1973Peterson28 Jan 195731 Aug 1957COMM

Disposition:
AGNameTDecommStrikeDisposalFateMA Sale
520ALACRITY30 Sep 197730 Sep 19771 Jul 1978Navy sale--
521ASSURANCE30 Sep 197730 Sep 19771 Jul 1978Navy sale--

Class Notes:
Approved characteristics for an Ocean Minesweeper (MSO) of a new 182' type (wooden hull), SCB Project 45B, were promulgated on 16 March 1955 and three MSOs were ordered to this design on 26 Oct 1955 from Peterson. (Project 45A for a Minesweeper (AM) had been promulgated on 10 Sep 1953.) On 11 Jun 1970 the first of the three ships, ABILITY (MSO 519), began a SCB 502.69 minehunter modernization (approved characteristics promulgated 31 July 1965 and 27 May 1970) under a contract of 2 Feb 1970 with Todd, Brooklyn, but the project was cancelled on 16 Oct 1970 and MSO 519 was struck on 1 Feb 1971 and sold on 3 Dec 1971. On 18 January 1973 CNO reclassified her two sisters, MSO 521 to AG 521 effective 1 March 1973 and MSO 520 to AG 520 effective 1 June 1973. They were then used as sonar research ships, the most visible conversion feature being the replacement of the minesweeping cable reels aft of the stack with a deckhouse.

Ship Notes:
AGNameMANotes
520ALACRITY(ex-MSO 520,ex-AM 520, comm. 1 Oct 1958) [Sold 28 Dec 1979 in Silverstone.]
521ASSURANCE(ex-MSO 521,ex-AM 520, comm. 21 Nov 1958)

Page Notes:
Compiled: 18 Oct 2021
© Stephen S. Roberts, 2021
Sources: DB, Maroon, NVR