Joint Air-to-Surface Standoff Missile

AGM-158 Joint Air-to-Surface Standoff Missile
Type	Air-to-surface cruise missile
Place of origin	United States
Service history
In service	2009–present
Used by	United States Air Force Royal Australian Air Force Finnish Air Force Polish Air Force
Production history
Manufacturer	Lockheed Martin
Unit cost	US$850,000 (JASSM) US$1.359m (JASSM-ER)(FY15)
Produced	1998–present
Specifications
Weight	1021 kg (2250 lb)
Length	4.27 m (14 ft)
Warhead	450 kg (1000 lb) WDU-42/B penetrator
Engine	Teledyne CAE J402-CA-100 turbojet 3.0 kN (680 lb)
Wingspan	2.4 m (7 ft 11 in)
Operational range	370+ km (230 mi) [JASSM] 1000+ km (620 mi) [JASSM-ER]
Guidance system	Global Positioning System (GPS)-aided inertial navigation system (INS), terminal infrared homing automatic target recognition
Launch platform	Integrated: B-1 Lancer B-2 Spirit B-52 Stratofortress F-15E Strike Eagle F-16 Fighting Falcon F/A-18 Hornet (Potential: F-35)

The AGM-158 JASSM (Joint Air-to-Surface Standoff Missile) is a low observable standoff air-launched cruise missile developed in the United States. It is a large, stealthy long-range weapon of the 2,000 pounds (910 kg) class. The missile's development began in 1995, but a number of problems during testing delayed its introduction into service until 2009. As of 2014, the JASSM has entered foreign service in Australia, Finland, and Poland. An extended range version of the missile, the AGM-158B JASSM-ER (Joint Air-to-Surface Standoff Missile-Extended Range), entered service in 2014.

By September 2016, Lockheed Martin had delivered 2,000 total JASSMs comprising both variants to the USAF.

The JASSM project began in 1995 after the cancellation of the AGM-137 TSSAM project. The TSSAM was designed as a high precision stealthy missile for use at stand-off ranges, but poor management of the project resulted in rising costs. Since the requirement for such weapons still existed, the military quickly announced a follow-up project with similar goals. Initial contracts for two competing designs were awarded to Lockheed Martin and McDonnell Douglas in 1996, and the missile designations AGM-158A and AGM-159A were allocated to the two weapons. Lockheed Martin's AGM-158A won and a contract for further development was awarded in 1998.

The AGM-158A is powered by a Teledyne CAE J402 turbojet. Before flight the wings are kept folded to reduce size. Upon launch the wings flip out automatically. There is a single vertical tail. Guidance is via inertial navigation with global positioning system updates. Target recognition and terminal homing is via an imaging infrared seeker. A data link allows the missile to transmit its location and status during flight, allowing improved bomb damage assessment. The warhead is a WDU-42/B 450 kg (1000 lb) penetrator. The JASSM will be carried by a wide range of aircraft: the F-15E; F-16; F/A-18; F-35; B-1B; B-2; and B-52 are all intended to carry the weapon.