Editing Boeing C-17 Globemaster III (section)

==Variants==
* '''C-17A:''' Initial military airlifter version.
* '''C-17A "ER":''' Unofficial name for C-17As with extended range due to the addition of the center wing tank.<ref name=bids_c17_fml/><ref name=norton_p93/> This upgrade was incorporated in production beginning in 2001 with Block 13 aircraft.<ref name=norton_p93>Norton 2001, p. 93.</ref>
** '''Block 16:''' This software/hardware upgrade was a major improvement of the improved Onboard Inert Gas-Generating System (OBIGGS II), a new weather radar, an improved stabilizer strut system and other avionics.<ref>{{Cite web|title=Boeing Frontiers Online|url=https://www.boeing.com/news/frontiers/archive/2005/september/i_ids1.html|access-date=2020-11-12|website=boeing.com}}</ref>
** '''Block 21:''' Adds [[Automatic dependent surveillance – broadcast|ADS-B]] capability, [[IFF Mark X|IFF]] modification, communication/navigation upgrades and improved flight management.<ref>{{Cite web|title=C-17 fleet Completes Block 21 Upgrade|url=https://www.aflcmc.af.mil/News/Article-Display/Article/2068589/c-17-fleet-completes-block-21-upgrade/|access-date=2020-11-12|website=Air Force Life Cycle Management Center|date=28 January 2020 |language=en-US}}</ref>
* '''C-17B:''' A proposed tactical airlifter version with double-slotted flaps, an additional main landing gear on the center fuselage, more powerful engines, and other systems for shorter landing and take-off distances.<ref>Trimble, Stephen. [https://www.flightglobal.com/news/articles/boeing-offers-c-17b-as-piecemeal-upgrade-314814/ "Boeing offers C-17B as piecemeal upgrade."] {{Webarchive|url=https://web.archive.org/web/20171207015031/https://www.flightglobal.com/news/articles/boeing-offers-c-17b-as-piecemeal-upgrade-314814/ |date=7 December 2017}} ''Flight International'', 19 August 2008.</ref> Boeing offered the C-17B to the U.S. military in 2007 for carrying the Army's [[Future Combat Systems]] (FCS) vehicles and other equipment.<ref>Trimble, Stephen. [http://www.flightglobal.com/articles/2007/10/16/218272/boeing-offers-c-17b-to-us-army.html "Boeing offers C-17B to US Army."] {{Webarchive|url=https://web.archive.org/web/20080704213619/http://www.flightglobal.com/articles/2007/10/16/218272/boeing-offers-c-17b-to-us-army.html |date=4 July 2008}} ''Flight International'', 16 October 2007.</ref>
* '''KC-17:''' Proposed [[aerial refueling|tanker]] variant of the C-17.<ref>FlightGlobal.[https://www.flightglobal.com/mdc-reveals-kc-17-cargo/tanker-details/5706.article "MDC reveals KC-17 cargo/tanker details"]</ref>
* '''MD-17:''' Proposed variant for US airlines participating in the [[Civil Reserve Air Fleet]],<ref>Sillia, George. [http://www.boeing.com/news/releases/1997/news_release_970828n.html "MD-17 Receives FAA Certification."] {{Webarchive|url=https://web.archive.org/web/20070609085801/http://boeing.com/news/releases/1997/news_release_970828n.html |date=9 June 2007}} ''Boeing'', 28 August 1997.</ref> later redesignated as '''BC-17X''' after 1997 merger.<ref>Saling, Bob. [http://www.boeing.com/news/releases/2000/news_release_000928a.html "Boeing Is Undisputed Leader In Providing Air Cargo Capacity (Boeing proposes BC-17X)."] {{Webarchive|url=https://web.archive.org/web/20110114120746/http://www.boeing.com/news/releases/2000/news_release_000928a.html |date=14 January 2011}} ''Boeing'' 28 September 2000.</ref><ref>{{Cite web |title=BC-17X Commercial Freighter |url=http://www.boeing.com/commercial/pd/bc17x/index.html |url-status=dead |archive-url=https://web.archive.org/web/20010215040948/http://www.boeing.com/commercial/pd/bc17x/index.html |archive-date=15 February 2001 |access-date=15 February 2001 |website=Boeing}}</ref>