Editing Alliant Techsystems (section)

====Precision Guidance Kit====
{{Main|XM1156 Precision Guidance Kit}}
The Precision Guidance Kit (PGK) is a United States Army program to develop a [[precision guidance]] system for existing 155&nbsp;mm [[artillery shell]]s.<ref name="GLOBSEC">{{cite web|url=http://www.globalsecurity.org/military/systems/munitions/m1156.htm|title=XM1156 Precision Guidance Kit (PGK)|author=John Pike|access-date=June 12, 2015}}</ref> The prime contractor is Alliant Techsystems and the project team includes Interstate Electronics Corporation.<ref name="ATKPGK_01">{{Cite web|url=http://www.atk.com/capabilities_defense/cs_ms_w_gp_pgk.asp|title=ATK Precision Guidance Kit (PGK) - ATK}}</ref> In operation the PGK will screw into the nose of the [[projectile]] much like the existing [[fuze]]. However, as well as the fuzing function it will provide a [[Global Positioning System|GPS]] [[Missile guidance|guidance]] package and [[Flight control surfaces|control surface]]s to correct the flight of the shell.  This is analogous to the addition of a [[Joint Direct Attack Munition]] (JDAM) tail-kit to a dumb iron bomb, creating a [[precision guided munition]].  Production started in 2009.<ref name="DEFNEWS_01">{{Cite web|url=http://defensenews.com/story.php?F=2793630&C=america|archive-url=https://archive.today/20130121093542/http://defensenews.com/story.php?F=2793630&C=america|url-status=dead|archive-date=2013-01-21|title=ATK To Make Precision Artillery Shell - defensenews.com}}</ref>