Editing Boeing E-3 Sentry (section)

====USAF Block 40/45====
In 2014 the USAF began upgrading block 30/35 E-3B/Cs into block 40/45 E-3Gs. This upgrade replaces the main flight computer with a [[Red Hat Linux]]-based system, as well as replacing the [[DOS operating system|DOS]] 2.0-like operating system with a [[Windows 95]]-like system on the operator workstations.<ref>{{Cite journal|last=Chen|first=Ernie|date=1 October 2017|title=The Future of AWACS: Technological Advancement or Technological Relic|url=https://apps.dtic.mil/sti/citations/AD1054654|archive-url=https://web.archive.org/web/20201204185357/https://apps.dtic.mil/sti/citations/AD1054654|url-status=live|archive-date=4 December 2020|language=en|via=Defense Technical Information Center}}</ref> In 2016, a three-week long cybersecurity vulnerability test revealed that the 40/45 block and its supporting ground equipment were vulnerable to cyber threats, and were thus deemed "not survivable."<ref>{{cite web|date=December 2016|title=Director, Operational Test and Evaluation FY 2016 Annual Report|url=https://www.dote.osd.mil/Portals/97/pub/reports/FY2016/other/2016DOTEAnnualReport.pdf?ver=2019-08-22-105134-547|access-date=26 November 2020|website=dote.osd.mil|pages=361–363|archive-date=24 October 2021|archive-url=https://web.archive.org/web/20211024133518/https://www.dote.osd.mil/Portals/97/pub/reports/FY2016/other/2016DOTEAnnualReport.pdf?ver=2019-08-22-105134-547|url-status=live}}</ref> This caused a delay of approximately two years.<ref>{{cite web|title=E-3 AWACS Block 40/45 Pushed Back Two Years|url=http://www.defense-aerospace.com/articles-view/release/3/181578/e_3g-awacs-block-40%C2%A745-pushed-back-two-years.html|access-date=27 November 2020|website=www.defense-aerospace.com|archive-date=21 October 2021|archive-url=https://web.archive.org/web/20211021052910/http://www.defense-aerospace.com/articles-view/release/3/181578/e_3g-awacs-block-40%C2%A745-pushed-back-two-years.html|url-status=live}}</ref> Twenty-four E-3s are projected to complete this upgrade to 40/45 by the end of [[fiscal year]] 2020, while seven aircraft will be retired to save upgrade costs and harvest out-of-production components.<ref>[https://www.flightglobal.com/news/articles/boeing-e-3g-makes-middle-east-combat-debut-419318/ Boeing E-3G makes Middle East combat debut] {{Webarchive|url=https://web.archive.org/web/20151120174217/https://www.flightglobal.com/news/articles/boeing-e-3g-makes-middle-east-combat-debut-419318/ |date=20 November 2015}} – Flightglobal.com, 19 November 2015</ref>