The AGM -158 JASSM ( Joint Air -to- Surface Standoff Missile ) is an air -to-ground cruise missiles of medium to high range. It is produced by the U.S. company Lockheed Martin.


The development of JASSM began in 1995, immediately after the AGM -137 TSSAM program had been canceled due to high costs. The development objective was now a far-reaching, cost effective and precision-guided LO missile, which should cost significantly less than the AGM -137 TSSAM. In June 1996, contracts were awarded for the development and risk reduction at McDonnell Douglas and Lockheed Martin. The competing missile designs were designated AGM- 158A and AGM - 159A, which Lockheed Martin won the contract in April 1998. The first flight test took place in November 1999, and the development of testing began in January 2001. Pilot production started in December the same year, and in mid-2002 began the operational test phase, which was completed in April 2003. In October 2003, the JASSM was declared fully operational.

During the test phase, the JASSM often showed only a low reliability, which is why it often led to delays and budget problems. Main problem was often the new, particularly interference- GPS receiver. Currently, therefore, additional funds have been granted to increase the reliability. During the 2009 tests conducted in accordance with the modified seventh contract section met 15 of 16 fired missiles. By May 2011, around 1100 JASSMs were delivered.


The JASSM navigated primarily of GPS / INS system, wherein in the GPS receiver, great emphasis was placed on noise immunity. To improve the precision of a FLIR sensor (256 × 256 pixels, 3-5 microns) is activated on the final approach, which scans by means of pattern recognition a particular area of the goal. This also limits the fight against mobile targets is possible. Through a data link the missile can be reprogrammed even in flight after launch. Further, a plurality of waypoints can be set.

The airframe of the JASSM is made entirely of composite materials and is primarily focused on a low radar and infrared signature. She has, in contrast to most current cruise missiles, no corner reflectors, irregular surfaces or tubular components. These measures also bypassing and dealing with modern air defense systems (eg SA-20 Gargoyle or SA -15 Gauntlet ) should be possible. To increase the range, the JASSM has two swivel wing which provides for additional dynamic lift. These are, as the rudder, collapsed for reasons of saving space and are only extended immediately after shedding.

The WDU-42/B-Gefechtskopf weighs around 450 kg contains 110 kg " AFX -757 " explosives, which has a much more intense effect than previous mixtures. The igniter has several modes of operation in order to combat both surface targets as well bunkered and hardened objects effectively.


AGM- 158A

The basic version, which is produced in series since the beginning of 2003. The U.S. Air Force has currently (as of July 2012) over almost 1100 missiles, in which an inventory is sought by 4600 piece (including ER- variant). Australia has announced in September 2006 that missiles are procured with a total value of 300 million AU $, the delivery is scheduled for 2009. The costs amount to approximately $ 400,000.

AGM- 158B

This variant, also called " JASSM -ER " is intended to include primarily through a strong increase in reach. In addition, a secure two-way data link is provided, which would significantly increase the capacity to combat maritime targets, where the funds for further development in 2009 have not been released, although the development has been running since 2005 and, accordingly, is well advanced. The airframe remains completely unchanged externally, but uses a new turbofan engine and can hold more fuel.

The first flight test took place in January 2006, the second test phase was completed in August 2012. The Air Force plans to procure 2500 JASSM -ER (as of August 2012).


  • F- 15E Strike Eagle
  • F-16C Fighting Falcon
  • F/A-18E/F Super Hornet
  • F -35 Lightning II
  • B-1B Lancer
  • B -2A Spirit
  • B- 52H Stratofortress


  • Length: 4.27 m
  • Width: 0.55 m
  • Height: 0.45 m
  • Wingspan: 2.41 m
  • Takeoff weight: 1020 kg
  • Drive: AGM- 158A: Teledyne CAE J402 -CA -100 turbojet with 3.0 kN
  • AGM- 158B: Williams F107 -WR -105 turbofan
  • AGM- 158A: > 370 km
  • AGM- 158B: .925 - 965 km
  • AGM- 158A: GPS, INS, FLIR, data link
  • AGM- 158B: GPS, INS, FLIR, two - way data link