Editing Virginia-class submarine (section)

=== Block IV ===
[[File:USS Vermont (SSN-792) underway on the Thames River at Groton, Connecticut (USA), on 15 October 2020 (201015-N-AY957-202).JPG|alt=USS Vermont is the first Block IV Virginia class submarine|thumb|{{USS|Vermont|SSN-792|6}} is the first Block IV ''Virginia''-class submarine.]]
Block IV consists of 10 submarines.<ref>{{cite web |title=U.S. Navy Fact Sheet Attack Submarines - SSN |url=http://www.navy.mil/navydata/fact_print.asp?cid=4100&tid=100&ct=4&page=1 |url-status=dead |archive-url=https://web.archive.org/web/20081122021103/http://www.navy.mil/navydata/fact_print.asp?cid=4100&tid=100&ct=4&page=1 |archive-date=22 November 2008 |access-date=7 September 2016 |publisher=Naval Sea Systems Command}}</ref> The [[2013 United States budget sequestration|2013 budget sequestration]] put this 10-submarine in doubt by budget sequestration that same year.<ref>{{cite news |url=http://breakingdefense.com/2013/09/navy-to-hasc-were-about-to-sign-sub-deals-we-cant-pay-for/ |title=Navy To HASC: We're About To Sign Sub Deals We Can't Pay For |first=Sydney |last=Freedburg |date=12 September 2013 |work=Breaking Defense |access-date=12 November 2013 |archive-url=https://web.archive.org/web/20131113065601/http://breakingdefense.com/2013/09/navy-to-hasc-were-about-to-sign-sub-deals-we-cant-pay-for/ |archive-date=13 November 2013 |url-status=live}}</ref> The most costly shipbuilding contract in history, worth $17.6&nbsp;billion, was awarded on 28 April 2014 to General Dynamics Electric Boat. The main improvement over the Block III is the reduction of major maintenance periods from four to three, increasing each boat's total lifetime deployments by one.<ref>{{cite news |last=LaGrone |first=Sam |title=U.S. Navy Awards 'Largest Shipbuilding Contract' in Service History |url=http://news.usni.org/2014/04/28/u-s-navy-awards-largest-shipbuilding-contract-service-history |date=28 April 2014 |work=USNI News |publisher=U.S. Naval Institute |access-date=28 April 2014 |archive-url=https://web.archive.org/web/20140429051159/http://news.usni.org/2014/04/28/u-s-navy-awards-largest-shipbuilding-contract-service-history |archive-date=29 April 2014 |url-status=live}}</ref>

The long-lead-time materials contract for SSN-792 was awarded on 17 April 2012, with SSN-793 and SSN-794 following on 28 December 2012.<ref>{{cite press release |url=https://www.defense.gov/contracts/contract.aspx?contractid=4771 |title=Contracts |date=17 April 2012 |publisher=U.S. Department of Defense |access-date=26 July 2013 |archive-url=https://web.archive.org/web/20130522171706/http://www.defense.gov/contracts/contract.aspx?contractid=4771 |archive-date=22 May 2013 |url-status=live}}</ref><ref>{{cite press release |url=http://www.defense.gov/contracts/contract.aspx?contractid=4946 |title=Contracts |date=28 December 2012 |publisher=U.S. Department of Defense |access-date=26 July 2013 |archive-url=https://web.archive.org/web/20130921085438/http://www.defense.gov/contracts/contract.aspx?contractid=4946 |archive-date=21 September 2013 |url-status=dead}}</ref> The U.S. Navy has awarded General Dynamics Electric Boat a $208.6&nbsp;million contract modification for the second [[fiscal year]] (FY) 14 ''Virginia''-class submarine, SSN-793, and two FY 15 submarines, SSN-794 and SSN-795. With this modification, the overall contract is worth $595&nbsp;million.<ref>{{cite press release |title=General Dynamics Awarded $209 Million for Future Virginia-class Submarines |url=http://www.generaldynamics.com/news/press-releases/detail.cfm?customel_dataPageID_1811=18534 |publisher=General Dynamics - Electric Boat |location=Groton, Connecticut |date=1 July 2013 |access-date=26 July 2013 |archive-url=https://web.archive.org/web/20130808103005/http://generaldynamics.com/news/press-releases/detail.cfm?customel_dataPageID_1811=18534 |archive-date=8 August 2013 |url-status=live}}</ref>
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