Editing ATACMS (section)

=== Stockpile upgrades ===

In January 2015, Lockheed Martin received a contract to develop and test new hardware for Block I ATACMS missiles to eliminate the risk of unexploded ordnance by 2016.<ref name="armyreco8jan15" /><ref name="armedint8jan15" /> The first modernized Tactical Missile System (TACMS) was delivered in September 2016 with updated guidance electronics and added capability to defeat area targets using a unitary warhead, without leaving behind unexploded ordnance.<ref>{{Cite web|date=29 September 2016|title=Lockheed Martin Delivers First Modernized TACMS Missile to US Army|url=http://armyrecognition.com/september_2016_global_defense_security_news_industry/lockheed_martin_delivers_first_modernized_tacms_missile_to_us_army_5290916.html|website=armyrecognition.com|access-date=30 September 2016|archive-date=19 September 2020|archive-url=https://web.archive.org/web/20200919031027/http://armyrecognition.com/september_2016_global_defense_security_news_industry/lockheed_martin_delivers_first_modernized_tacms_missile_to_us_army_5290916.html|url-status=live}}</ref><ref>{{Cite web|date=18 October 2016|title=Precision fires milestone for US Army|url=https://www.military1.com/military-weapons/article/1645199014-precision-fires-milestone-for-us-army/|website=www.military1.com|access-date=19 October 2016|archive-date=19 October 2016|archive-url=https://web.archive.org/web/20161019212728/https://www.military1.com/military-weapons/article/1645199014-precision-fires-milestone-for-us-army/|url-status=dead}}</ref>
Lockheed was awarded a production contract for launch assemblies as part of the SLEP in August 2017.<ref>{{Cite web|date=4 August 2017|title=Lockheed Martin contracted to provide new launch system for the ATACMS missile|url=https://armyrecognition.com/august_2017_global_defense_security_news_industry/lockheed_martin_new_launch_system_atacms_missiles_80408171.html|website=armyrecognition.com|access-date=4 August 2017|archive-date=11 November 2020|archive-url=https://web.archive.org/web/20201111170910/https://armyrecognition.com/august_2017_global_defense_security_news_industry/lockheed_martin_new_launch_system_atacms_missiles_80408171.html|url-status=live}}</ref>
In 2021, Lockheed Martin was contracted to upgrade existing M39 munitions to the M57 variant with a WDU-18/B warhead from the [[Harpoon missile]] by 2024.<ref name=militaryaerospace-m57>{{cite web|url=https://www.militaryaerospace.com/sensors/article/14207794/munitions-navigation-and-guidance-payloads|title=StackPath|date=30 July 2021 |access-date=29 May 2022|archive-date=2 August 2021|archive-url=https://web.archive.org/web/20210802085218/https://www.militaryaerospace.com/sensors/article/14207794/munitions-navigation-and-guidance-payloads|url-status=live}}</ref>

A plan announced in October 2016 to add an existing seeker to enable the ATACMS to strike moving targets on land and at sea<ref>{{Cite web|last=Freedberg|first=Sydney J. Jr.|date=28 October 2016|title=Carter, Roper Unveil Army's New Ship-Killer Missile: ATACMS Upgrade|url=https://breakingdefense.sites.breakingmedia.com/2016/10/army-atacms-missile-will-kill-ships-secdef-carter/|website=Breaking Defense|language=en-US|access-date=30 April 2022|archive-date=30 April 2022|archive-url=https://web.archive.org/web/20220430055239/https://breakingdefense.com/2016/10/army-atacms-missile-will-kill-ships-secdef-carter/|url-status=live}}</ref> was terminated in December 2020 to pursue other missile efforts.<ref>{{Cite web|last=Judson|first=Jen|date=23 December 2020|title=US Army's cross-domain tactical missile dies in FY21 defense spending bill|url=https://www.defensenews.com/land/2020/12/23/cross-domain-army-tactical-missile-terminated-in-fy21-defense-spending-bill/|website=[[Defense News]]|language=en}}</ref>