The US Air Force and Boeing have tested an AGM-86C Conventional Air-Launched Cruise Missile (CALCM) with an improved global- positioning system (GPS). In the test, a CALCM launched from a Boeing B-52H was flown for about 5h before precisely impacting the target area. The demonstration also included a steep-terminal-dive manoeuvre for delivering penetrator warheads - the first time that such a manoeuvre has been performed by a CALCM. The weapons are converted AGM-86B air-launched cruise missiles. They were used in strikes against Iraq. The new GPS receiver has design changes to improve navigational accuracy.
Source: Flight International