Posted: April 01, 2019 | Modified: June 14, 2021

The Advanced Joint Effectiveness Model, or AJEM, is a survivability, lethality, and vulnerability (SLV) computer simulation code capable of analyzing one or more threats attacking one or more rotary-wing or fixed-wing aircraft, small watercraft, ground-mobile system, and mounted or dismounted personnel. It combines elements of target modeling, threat modeling, encounter kinematics, generation of weapon burst points, propagation of damage mechanisms to the target, damage mechanism/target interaction (penetration, fire, blast, behind-armor-debris (BAD), etc.), target system relationships (functionality, redundancies, etc.), and target remaining capability or loss of function.

AJEM produces results that are applicable during all phases of weapon system acquisition, from research, design, and development to production test and evaluation. The results are relevant to both acquisition decision makers and soldiers in the field.

AJEM is designed to run in conjunction with BRL-CAD, MUVES, and MUVES Tool Kit (MTK) environment, capitalizing on work already performed by ARL/SLAD.


AJEM requires the following data input for execution and analysis:

  • Geometric target description – BRL-CAD format
  • Criticality/Fault tree data
  • Component Pcd/h data
  • System probability of kill given damage data
  • Threat characterization data


AJEM determines the outcome of threat and target interactions in terms of vulnerable area, probability of kill (Pk), probability of damage, number of hits, and number of perforations to components, sub-systems, or systems as defined by the user. The data can be output in tabular format or in a graphical display plot (Cell-by-Cell Pk Plot).

Model Specifications
Version 4.21.2
Archived Versions Available 2.49, 2.53, 2.54, 2.55, 2.56, 2.57, 2.59, 4.20.1,,,, 4.20.4
Host Systems UNIX, Windows, LINUX
Program Language Red Hat Enterprise Linux (RHEL) 6 and CentOS Linux 6 for 64-bit with GCC 4.4.7, Windows 7
Software Change Request Database
Page Distribution

Distribution Statement A: Approved for public release by ARL - 23 October 2017; distribution is unlimited.

Model Distribution

DISTRIBUTION STATEMENT D. Distribution authorized to Department of Defense and U.S. DoD contractors only. Critical Technology. October 12, 2017. Other request for this document shall be referred to U.S. Army Research Laboratory.

Requests from non-U.S. Agencies must be forwarded to their country’s U.S. embassy.

Model Request Instructions

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